Ibnul-Qayyimرحمه الله said:
“From the greatest of sins which are hidden – and widely practiced – is that the servant is enjoying a blessing that Allaahسُبحانه وتعالى has blessed him with and chosen for him, then that servant becomes bored of it and seeks to exchange it for what he thinks (due to his ignorance) is better for him than it, and His Lord continues to be merciful to him and does not prevent him from this blessing, and He excuses him due to his ignorance and this bad choice that he has chosen for himself. When he reaches the limit in scorning this blessing and his boredom with it overcomes him, Allaahسُبحانه وتعالى removes this blessing from him.
So, if he is given what he sought in exchange for that blessing, and he sees the immense difference between what he was previously enjoying and what he has now been given instead of it, his anxiety and regret increase and he requests a return to what he previously had. So, if Allaah سُبحانه وتعالى desires good and guidance for His servant, He allows him to bear witness that what he had was a blessing from the blessings of Allaah upon him, and He causes him to become pleased with that blessing and to give thanks to Allaah سُبحانه وتعالى for it. If his soul then whispers to him to again seek to exchange that blessing for something else, he makes istikhaarah to His Lord, the istikhaarah of the one who is ignorant of what is in his best interests and unable to attain them. He turns his affairs to Allaah, requesting of Him to help him make the best decision.
And this is because the path that takes one to Allaah is one, and it is what He sent His Messengers and revealed His Books with, and nothing can take one to Allaah, except this one path. And even if the people were to come from every path, and they entered through every door, then all of these paths would be obstructed for them and all of those doors would be closed for them, except this one path; since it is the one that takes one to Allaah.
Know – may Allaah have mercy upon you – that the path which will guarantee the bounty of Islaam for you is one, not numerous paths; because Allaah has written success for one party (hizb) only. So He said,
“These are the Party of Allaah. Indeed the Party of Allaah is successful.” [Sooratul-Mujaadilah 58:22]
And He has written victory for this party alone, so He said,
“And whosoever takes Allaah, His Messenger and the Believers as protectors, then verily the Party of Allaah is successful.” [Sooratul-Maa‘idah 5:56 ]
So regardless of how much you search in the Book of Allaah and in the Sunnah of His Messenger (sallallaahu ’alayhi wa sallam), you will not find anything permitting splitting the Ummah up into jamaa’aat (groups), and splitting it up into ahzaab (parties) and blocs, except that it is blameworthy. Allaah the Exalted said,
“And do not be from amongst the disbelievers, those who split up their Religion and became sects; every party being pleased with what is with it.” [Sooratur-Room 30:31-32]
And how could our Lord the Mighty and Majestic affirm division for the Ummah after He had safeguarded it with His Rope and freed His Prophet from it when it became like that; and after He had threatened it by saying,
“Verily those who split up their Religion and become sects, you have nothing to do with them in the very least. Verily their affair is only with Allaah, they shall be informed of what they used to do.” [Sooratul-An’aam 6:159]
From Mu’aawiyah Ibn Abee Sufyaan who said, ‘Verily the Messenger of Allaah stood amongst us and said, ‘Verily before you, the People of the Book split up into seventy-two sects, and verily this Religion shall split up into seventy three sects. Seventy-two of them will be in the Fire and one will be in Paradise , and it is the Jamaa’ah.”  So al-Ameer as-Sam’aanee said – rahimahullaah – said, “Mentioning the number (in the hadeeth) does not fully describe those who are destroyed, it only expounds upon the wide range of misguided paths and their offshoots, in comparison to the one true path. That is what the Scholars of Tafseer (explanation of the Qur‘aan) have mentioned in regards to the statements of Allaah,
“And do not follow the other paths, since they will separate you from His Paths.” [Sooratul-An’aam 6:53]
So He gathered together all of the prohibited paths along with their followers in order to explain the abundancy of the paths to misguidance and their wide range, and he lacked He singled out the path to guidance and the truth and its lack of plurality.”  From Ibn Mas’ood (radiyallaahu ’anhu) who said, ‘The Messenger of Allaah (sallallaahu ’alayhi wa sallam) drew a line for us, then he said, ‘This is the Path of Allaah,’ then he drew lines branching off from its right and its left. Then he said, ‘These are (other) paths, and upon each one of them is a devil calling to them.’ Then he recited,
“And verily this is My Straight Path, so follow it, and do not follow other paths, since they will separate you from His Path.” [Sooratul-An’aam 6:153]’ 
So this hadeeth proves through its text that the path is one. Ibnul-Qayyim (d.751H) said, “And this is because the path that takes one to Allaah is one, and it is what He sent His Messengers and revealed His Books with, and nothing can take one to Allaah, except this one path. And even if the people were to come from every path, and they entered through every door, then all of these paths would be obstructed for them and all of those doors would be closed for them, except this one path; since it is the one that takes one to Allaah.”  I say however, that the one who is unstable upon it will encounter doubt and feebleness. And the one who deviates only deviates to the sect due to numbers and fears being alone and hastily proceeds to the destination and cowers away from the long trip. Ibnul-Qayyim said, “Whoever makes the path long, his walk will become weak.”  And Allaah is the One from Whom aid is sought.
KNOWING THE PATH:
From the speech of Ibnul-Qayyim, the path is first explained and the intended meaning of path here, is the second pillar from the pillars of Tawheed. So after the testification that there is no deity worthy of worship besides Allaah, comes the testification that Muhammad is the Messenger of Allaah. And this is also the second pillar from the pillars of action and acceptance. Therefore, an action is not accepted – as is known – except by the fulfillment of two conditions:
 Making the Religion sincerely for Allaah
 Placing the Messenger of Allaah as an example to be followed
And I will not focus upon the derivation of this great principle right now, because the goal of this section is to explain the Prophetic path about which, it is not possible to reach Allaah. So, ‘ignorance of the path and its signs and the intended goal, necessitates much toil for little benefit.’ So it should be clear that this path is one. It does not exceed the advices of the Messenger of Allaah (sallallaahu ’alayhi wa sallam) by callers to the Path of Allaah, being as numerous as the souls of the human beings and other them, from that which is known to falsified by the Religion of Allaah which came to unite its people, not to divide them. Indeed Allaah the Exalted said,
“And hold onto the Rope of Allaah altogether and do not be divided. And remember the bounty of Allaah upon you when you were enemies. So He united your hearts, so you became brothers through His Blessing.” [Soorah Aali-’Imraan 3:103]
Indeed this trustworthy rope which has gathered the Muslims together has been explained as being the Book of Allaah. Ibn Mas’ood (rahimahullaah) said, “This path is inhabited, the devils occupy it calling out, ‘O servant of Allaah, come on! This is the Path,’ in order to discourage them from the Path of Allaah.  So they hold firmly to the Path of Allaah, so the Path of Allaah is the Book of Allaah.” So there are two benefits found in this narration:
Firstly, that the path is one, and the devils only surround it for the purpose of dividing the people away from it. So they do not find a better way to divide them, than calling them to increasing the number of the path! So whoever wishes to misguide the people by claiming that the truth is not contained entirely in one path, then he is surely a devil. Indeed Allaah the Exalted said,
“So what is after the truth except falsehood?” [Soorah Yoonus 10:32]
Secondly, the Path of Allaah – which it is obligatory upon all of the Muslims to hold onto – is explained as the Book of Allaah. And this does not contradict the statement of Ibn Mas’ood (radiyallaahu ’anhu), “The Straight Path is what the Messenger of Allaah (sallallaahu ’alayhi wa sallam) left us upon.”  And that is because the Messenger of Allaah (sallallaahu ’alayhi wa sallam) left them upon the Book and the Sunnah, as he himself, “I have left you upon that which, if you hold firmly to it, you will never go astray after me; the Book of Allaah and my Sunnah.”  This is so, because the Sunnah is like the Book of Allaah in its nature, it is revelation, then it is an explanation of the Book of Allaah. Rather, the best person to explain the Speech of Allaah from His creation is the Messenger of Allaah (sallallaahu ’alayhi wa sallam), as Allaah the Glorified said,
“And We have revealed to you the Remembrance, so that you may explain to the people what has been revealed to them.” [Sooratun-Nahl 16: 44]
And ’Aa‘ishah (radiyallaahu ’anhaa) said, “His character was the Qur‘aan.”  So due to this, the Prophet (sallallaahu ’alayhi wa sallam) commanded his Ummah to hold firmly to his Sunnah when division creeps into it, so he said, “And whomsoever from amongst you lives, then he shall see much differing. So adhere strictly to my Sunnah and the Sunnah of the Rightly Guided Caliphs after me. Hold onto it with your molar teeth and beware of newly invented affairs, since every newly invented affair is an innovation…”  Ibn Battah (d.387H) – rahimahullaah – said in explanation of the unity of the word of the Salaf upon one creed, “So the first generation did not cease to be upon this, their hearts were united as well as their madhaahib; the Book of Allaah and the Sunnah of al-Mustafaa was their guide. They did not act upon opinions, nor did they rush towards desires. So the people will not cease to remain upon that and the hearts will be safeguarded and protected by their master, and the souls will remain protected from their desires, along with their concern being focused.”  So he – may Allaah bestow mercy upon him – has spoken truthfully, since the Religion of Allaah is one, not variant. Allaah the Glorified said,
“And if it was from other than Allaah, you would have seen in it much differing.” [Sooratun-Nisaa‘ 4:82]
So this is the path which we call the people to, it is the clearest, fully explained, most sufficient and most complete of paths. So from al-’Irbaad Ibn Saariyah (radiyallaahu ’anhu) who said, ‘The Messenger of Allaah (sallallaahu ’alayhi wa sallam) said, ‘Indeed I have left you upon a clear white path, its night is like its day. No one deviates from it after me, except that he is destroyed.”  So when a person changes or alters it with something that the Messenger of Allaah (sallallaahu ’alayhi wa sallam) and his Companions did not do, then this only brings about splitting into various paths. Rather, it leads to the valley of destruction, and this is what the Messenger of Allaah (sallallaahu ’alayhi wa sallam) called, ‘the misguided innovation.’ So due to this, the Salaf were extreme in their opposition to the one who increases something into the Religion, or the one who intrudes upon it with his opinion. ’Umar Ibnul-Khattaab (radiyallaahu ’anhu) said, “Beware of sitting with the people of opinion, since they are the enemies of the Sunnah. They retain the Sunnah in order to memorize it, and they forget [And in a narration, “…and it slips away from them…”] the ahaadeeth that they have memorized. So they are asked about that which they do not know, and they are shy to say, ‘We do not know.’ So they give rulings by their opinions, so they go astray and they lead many others astray. So they go astray from the Straight Path. Verily Allaah did not take your Prophet until the Revelation had left no room for opinion. If the opinion took precedence over the Sunnah, then wiping over the bottom of the socks would take precedence over the tops.”  That is because the Religion is built upon following (ittibaa’), not invention and opinion in most cases; because the intellect alone cannot guide one to most of the affairs of the Religion, especially since the intellects contrast in their perceptions and realizations, and the opinion has already been mentioned.” 
And Ibn Mas’ood said, “Follow and do not innovate, for indeed you have been sufficed with. Hold onto the old affair.”  And ’Abdullaah Ibn ’Umar (radiyallaahu ’anhu) said, “Every innovation is misguidance, even if the people see it as something good.”  So as long as I am mentioning the effects of innovation in cutting off the way to the Straight Path for the seeker, then verily I must mention the narration of Ibn ’Abbaas concerning that. It shows the vast knowledge of the Companions. So from ’Uthmaan Ibn Haadir who said, ‘I entered upon Ibn ’Abbaas, so I said, ‘Will you advise me?’ So he said, ‘Yes! Adhere strictly to the fear of Allaah and steadfastness and the narration. Follow and do not innovate.”  So reflect upon this, he gathered two affairs in it, they are:
[i] The taqwaa (fear, reverence) of Allaah, and it means ikhlaas (sincerity) here, because it is attached to ittibaa’ (following).
[ii] And al-ittibaa’ which refers tot he Straight Path, as has preceded.
Then he warned him against that which opposes that, which is innovation. So this is how the Speech of the Salaf used to be; collective in meaning, yet concise. Indeed the Salafus-Saalih were extremely harsh in pushing forth the statements of men in order to shove aside the rulings of the Messenger of Allaah (sallallaahu ’alayhi wa sallam), regardless of whatever high status or nobility these men may have. There is no problem in having good manners with the people of knowledge and loving them and giving precedence to them over others and being doubtful of a person who places his own opinion along with theirs in a matter of great importance. However, this is one thing, and giving precedence to the text from the two forms of Revelation is another thing. ’Urwah said to Ibn ’Abbaas, “Woe to you! Do you misguide the people? You have permitted ’Umrah in the first ten days (of Muharram), yet there is no ’Umrah in them!” So he said, “O ’Urwah! Verily Abaa Bakr and ’Umar do not say that, yet they are more knowledgeable and better in following the Messenger of Allaah (sallallaahu ’alayhi wa sallam) than you.” So he said, “From there you have come! We come with the Messenger of Allaah (sallallaahu ’alayhi wa sallam), and you come with Abee Bakr and ’Umar?!” [And in a narration, “Woe to you! Are the two of them to be related from, according to you, or what is found in the Book of Allaah and the Sunnah of His Messenger of Allaah (sallallaahu ’alayhi wa sallam) for his Companions and his Ummah?!”] And in a narration, “I see that they will be destroyed. I say, ‘The Prophet (sallallaahu ’alayhi wa sallam) said,’ and it is said, ‘Aboo Bakr and ’Umar forbade.” 
Shaykh ’Abdur-Rahmaan Ibn Hasan (d.1258H) – rahimahullaah – said after quoting this narration, “And in the speech of Ibn ’Abbaas is that which proves that taqleed (blind-following) towards an imaam is not to be done by the one whom the proof has reached. So it is obligatory to oppose him severely due to his opposition to the proof.”  He also said, “Indeed it has become a general necessity with this evil, especially from the one who ascribes himself to knowledge, that they have set up obstacles to obstruct taking from the Book and the Sunnah and they have prevented the following of the Prophet (sallallaahu ’alayhi wa sallam) along with the exaltation of his command and prohibition. So from that is their statement, ‘The Book and the Sunnah cannot be used as a proof, except by the mujtahid (one who is qualified extract rulings from the Revelation), and ijtihaad has already been closed off.’ And they say, ‘This is a case in which the one whom you are making taqleed of is more knowledgeable than you about hadeeth and its abrogater and abrogated.’
So the likes of these statements, whose goal is to leave off following the Messenger (sallallaahu ’alayhi wa sallam), who does not speak form his own desire, and to place reliance upon one who could be mistaken. And other than him from the Scholars may oppose him and prohibit his statement with proof. So there is no scholar, except that he has some knowledge, but not all of it. So it is obligatory upon everyone under obligation, that if the proof reaches him from the Book of Allaah and the Sunnah of His Messenger (sallallaahu ’alayhi wa sallam). So the (correct) understanding is that he must act upon it, even though he will be opposing whoever he will be opposing, as Allaah the Exalted said,
“Follow that which has been revealed to you from your Lord, and do not follow protectors other than Him; yet you remember little.” [Sooratul-A’raaf 7:3]
And He said,
“Is it not sufficient for them that We revealed to you the Book, which is recited to them? Verily in it is a mercy and a reminder for a people who believe.” [Sooratul-’Ankaboot 29:51]
Indeed an ijmaa’ (consensus) has already been mentioned concerning that, and it has been explained that the muqallid (blind-follower) is not from the people of knowledge. Indeed a consensus has already been mentioned concerning that by Aboo ’Umar Ibn ’Abdul-Barr and other than him.” 
 Taken from Sittu Durar min Usool Ahlil-Athar (p. 51-61) of ’Abdul-Maalik Ramadaanee
 Saheeh: Related by Ahmad (4/102), Aboo Daawood (no. 4597), ad-Daarimee (2/241), at-Tabaraanee (9/376, 884-885) and al-Haakim (1/28). It was authenticated by al-Albaanee in Silsilatul-Ahaadeethus-Saheehah (no. 203).
 Hadeeth Iftiraaqul-Ummah ilaa Nayyif wa Sab’een Firqah (p. 67-68)
 Saheeh: Related by an-Nisaa‘ee (no. 184) and Ahmad (1/435) and this wording is by him. It is also related by ad-Daarimee (1/67-68) and at-Tabaree in Jaami’ul-Bayaan (8/65).
 at-Tafseerul-Qayyim (p. 14-15)
 al-Fawaa‘id (p. 90)
 al-Fawaa‘id (p. 223)
 Saheeh: Related by Aboo ’Ubayd in Fadaa‘ilul-Qur‘aan (p. 75), ad-Daarimee (2/433), as-Sunnah (no. 22) of Ibn Nasr, Fadaa‘ilul-Qur‘aan (p. 74) of Ibn Darees, and Ibn Jareer in his Tafseer (no. 7566), at-Tabaraanee (9/9031), ash-Sharee’ah (no. 16) of al-Aajurree, al-Ibaanah (no. 135) of Ibn Battah.
 Saheeh: Related by at-Tabaraanee (10/10454), al-Bayhaqee in ash-Shu’ab (4/1487). And the likes of it has been related by Ibn Jareer in his Tafseer (8/88-89).
 Hasan: Related by Ibn Nasr in as-Sunnah (no. 69), Ibnul-Waddaah in al-Bida’ (no. 76), al-Haakim (1/93), and al-Albaanee declared it authentic in his notes to al-Mishkaat (no. 186).
 Related by Muslim (no. 746) and Ahmad (6/91, 163)
 Saheeh: Related by Aboo Daawood (no. 4607) and at-Tirmidhee (no. 2676)
 al-Ibaanah (1/237) of Ibn Battah al-’Akbaree
 Saheeh: Related by Ahmad (4/126), Ibn Maajah (no. 5, 43), as-Sunnah (no. 48-49) of Ibn Abee ’Aasim and al-Haakim (1/96). It was authenticated by al-Albaanee in Dhilaalul-Jannah fee Takhreejis-Sunnah (1/27).
 Related by Ibn Zamneen in Usoolus-Sunnah (no. 8) and al-Laalikaa‘ee in Sharh Usoolul-I’tiqaad (no. 201), al-Khateeb al-Baghdaadee in al-Faqeeh wal-Mutafaqqih (p. 476-480), Jaami’ Bayaanul-’Ilm wa Fadlihi (no. 2001, 2003-2005), Ibn Hazm in al-Ihkaam (6/42-43), and al-Bayhaqee in al-Madkhal (no. 213) and Qiwaamus-Sunnah (1/205).
 For a detailed explanation of this, refer to I’laamul-Muwaqqi’een (1/63)
 Saheeh: Related by Wakee’ in az-Zuhd (no. 315), ’Abdur-Razzaaq (no. 20456), Aboo Khaythamah in al-’Ilm (no. 54), Ahmad in az-Zuhd (p. 62), ad-Daarimee (1/69), Ibnul-Waddaah in al-Bida’ (no. 60), Ibn Nasr in as-Sunnah (no. 78, 85), at-Tabaraanee (9/8770, 8845), Ibn Battah in al-Ibaanah (no. 168-169), al-Laalikaa‘ee in Sharh Usoolul-I’tiqaad (no. 104-108), al-Bayhaqee in al-Madkhal (no. 387-388), al-Khateeb in al-Faqeeh wal-Mutafaqqih (1/43). It was authenticated by al-Albaanee in Kitaabul-’Ilm of Abee Khaythamah.
 Saheeh: Related by Ibn Nasr in as-Sunnah (no. 82), al-Laalikaa‘ee in Sharh Usoolul-I’tiqaad (no. 126) and al-Bayhaqee in al-Madkhal (no. 191).
 Related by ad-Daarimee (1/53), Ibn Waddaah in al-Bida’ (no. 61), Ibn Nasr in as-Sunnah (no. 83), Ibn Battah in al-Ibaanah (no. 200-206), and al-Khateeb in al-Faqeeh wal-Mutafaqqih (1/83).
 Hasan: Related by Ishaaq Ibn Raahwayh, as is found in al-Matlabul-’Aaliyah (no. 1306), Ibn Abee Shaybah (4/103) and by at-Tabaraanee (24/92) by way of him. And it is related by Ahmad (1/252, 323, 337) and by at-Tabaraanee also in al-Awsat (1/42) and by al-Khateeb al-Baghdaadee in al-Faqeeh wal-Mutafaqqih (no. 379-380) and by Ibn ’Abdul-Barr in is Jaami’ (no. 2378-2381). It was authenticated by Ibn Hajar in al-Matlab, and it was declared hasan by al-Haythamee in al-Majma’ (3/234) and by Ibn Muflih in al-Aadaabush-Shar’iyyah (2/66).
 Fathul-Majeed Sharh Kitaabut-Tawheed (p. 338)
 Fathul-Majeed (p. 339-340)