Shaykh Saaleh ahl-Shaykh mentions in his explanation of kashf ash-Shubuhaat (Clarification of the Doubts), the following story:
Shaykh-ul-Islam Muhammad ibn Abdul-Wahhaab(rahimahullah) was with his students and after having completed the study of his book 'Kitab at-Tawheed', he wished to start again the study of this book for the 3rd or 4th time.
His students said to him : "O Shaykh, we wish to study another book, a book of fiqh or hadith".
The Shaykh replied: "Why (do you wish to study another book)?".
His students: "We have in fact understood Tawheed, we want to study another science".
The Shaykh: "Wait, I shall give some thought to this".
A few days later, the shaykh came to the lesson with a troubled face. His students asked him the reason for it.
The shaykh explained that he'd come across something which angered him. His students asked what it was.
The Shaykh: "It has been related to me that the inhabitants of a house have sacrificed a rooster (for a Jinn) in front of their door. I have sent someone to confirm this affair".
Some time later, his students asked him about the affair that he had mentioned.
The Shaykh replied: "In fact, the inhabitants of this house did not sacrifice for other than Allaah, but it was someone who fornicated with his mother".
Shocked, his students exclaimed:"We seek refuge with Allaah! He fornicated with his mother? We seek refuge with Allaah! He fornicated with his mother...".
After mentioning this story, Shaykh Saleeh explained that Shaykh-ul-Islam told this story to show them that the statement "We understand Tawheed" is ignorance and is one of the greatest tricks of the Shaytaan.
In fact, they have made greater a great sin [fornicating with one's mother] than shirk which exits from Islam.
Indeed, their hearts were not angered when the shirk that exits from Islam was mentioned.
And this also happens today, when some ignorant people see great sins and are angered by them, but when they hear about Shirk al-Akbar, or see people commiting shirk like sacrificing for other than Allaah, etc. this does not move their hearts.
This proves their ignorance. It proves that they have not understood Tawheed.
Ahadith Qudsi-Superiority of Monotheism
Narrated Abu Huraira (r.a.) Allah's Messenger
saw said: Allah (Most high) said: Among all partners, I am the most dispensable with association. So anyone who performs a deed in which he ascribes to Me others; I will abandon him and his act of polytheism.(This Hadith is sound and reported by Muslim)
Shirk (polytheism) is a sin that if its doer dies without repentance, he will never be forgiven. Verily, whosoever sets up partners in worship with Allah, Allah has forbidden Paradise for him; and the Fire will be his abode.One whose intention is not pure will deserve Hell. Purity of intention is essential in all deeds.
Narrated Abu Huraira (r.a.): I heard Allah's Messenger (s.a.w.s.) saying:
The first of the people whose case will be decided on the Day of Judgment will be a man who died as a martyr. He will be brought forth. Allah will make him know about His blessings (Which He had bestowed on him in the world). The man will acknowledge them. Then Allah will ask him: What did you do with them? He will say: I fought in Your way until I died as a martyr. Allah will remark: You are lying. You fought so that you may be called a brave warrior. Then orders will be passed against him. So he will be dragged along on his face and cast into Hell.
Second will be a man who studied (religious) knowledge. Then he taught it to others and recited the Qur'an. He will be brought (for judgment). Allah will remind him of His favours (showered on him in the world). He will admit them (having enjoyed them in his life). Then Allah will ask him: What did you do with them? He will reply: I acquired knowledge and imparted it and also recited the Qur'an for Your sake. Allah will observe: You have told a lie, for you got knowledge to be renowned as a scholar; and you recited the Qur'an to be marked as Qari (one who recites the Qur'an according to the rules). Then orders will be passed against him. So he will be dragged along on his face and thrown into Hell.
Third will be a man to whom Allah had made abundantly rich and granted him every kind of wealth. He will be brought for Judgment. Allah will let him know about His gifts conferred upon him in the world. He will recognize them. Then Allah will inquire: What did you with them? He will say: I left no way in which You like money to be spent without spending in it for Your sake. Allah will say: You are lying, You did so to be described as generous (in the society); (It means you got your reward in the world according to your intention). Now you deserve nothing in the Hereafter except Hell). So orders will be passed against him and he will be dragged along on his face until he will be hurled into Hell.
(This Hadith is sound and reported by Muslim and Nasa'i)
The purity of intention is behind any deed. If you spend for show, there is no reward. Eventually, if one loves another for something worldly this shall not count in the Hereafter. But love for the sake of Allah Assawajal is great virtue in the Hereafter. Such love can be a Muslim's love to learn from him or to take as a companion for good deeds, without any worldly considerations, once there is something worldly, the intention is not pure.
Taken from Darussalam
Saying of the Prophet Muhammad (s.a.w.s.) Having Allahs Statements
Shaykh-ul-Islam Muhammad ibn Abdul-Wahhaab(rahimahullah) was with his students and after having completed the study of his book 'Kitab at-Tawheed', he wished to start again the study of this book for the 3rd or 4th time.
His students said to him : "O Shaykh, we wish to study another book, a book of fiqh or hadith".
The Shaykh replied: "Why (do you wish to study another book)?".
His students: "We have in fact understood Tawheed, we want to study another science".
The Shaykh: "Wait, I shall give some thought to this".
A few days later, the shaykh came to the lesson with a troubled face. His students asked him the reason for it.
The shaykh explained that he'd come across something which angered him. His students asked what it was.
The Shaykh: "It has been related to me that the inhabitants of a house have sacrificed a rooster (for a Jinn) in front of their door. I have sent someone to confirm this affair".
Some time later, his students asked him about the affair that he had mentioned.
The Shaykh replied: "In fact, the inhabitants of this house did not sacrifice for other than Allaah, but it was someone who fornicated with his mother".
Shocked, his students exclaimed:"We seek refuge with Allaah! He fornicated with his mother? We seek refuge with Allaah! He fornicated with his mother...".
After mentioning this story, Shaykh Saleeh explained that Shaykh-ul-Islam told this story to show them that the statement "We understand Tawheed" is ignorance and is one of the greatest tricks of the Shaytaan.
In fact, they have made greater a great sin [fornicating with one's mother] than shirk which exits from Islam.
Indeed, their hearts were not angered when the shirk that exits from Islam was mentioned.
And this also happens today, when some ignorant people see great sins and are angered by them, but when they hear about Shirk al-Akbar, or see people commiting shirk like sacrificing for other than Allaah, etc. this does not move their hearts.
This proves their ignorance. It proves that they have not understood Tawheed.
Ahadith Qudsi-Superiority of Monotheism
Narrated Abu Huraira (r.a.) Allah's Messenger
saw said: Allah (Most high) said: Among all partners, I am the most dispensable with association. So anyone who performs a deed in which he ascribes to Me others; I will abandon him and his act of polytheism.(This Hadith is sound and reported by Muslim)Shirk (polytheism) is a sin that if its doer dies without repentance, he will never be forgiven. Verily, whosoever sets up partners in worship with Allah, Allah has forbidden Paradise for him; and the Fire will be his abode.One whose intention is not pure will deserve Hell. Purity of intention is essential in all deeds.
Narrated Abu Huraira (r.a.): I heard Allah's Messenger (s.a.w.s.) saying:
The first of the people whose case will be decided on the Day of Judgment will be a man who died as a martyr. He will be brought forth. Allah will make him know about His blessings (Which He had bestowed on him in the world). The man will acknowledge them. Then Allah will ask him: What did you do with them? He will say: I fought in Your way until I died as a martyr. Allah will remark: You are lying. You fought so that you may be called a brave warrior. Then orders will be passed against him. So he will be dragged along on his face and cast into Hell.
Second will be a man who studied (religious) knowledge. Then he taught it to others and recited the Qur'an. He will be brought (for judgment). Allah will remind him of His favours (showered on him in the world). He will admit them (having enjoyed them in his life). Then Allah will ask him: What did you do with them? He will reply: I acquired knowledge and imparted it and also recited the Qur'an for Your sake. Allah will observe: You have told a lie, for you got knowledge to be renowned as a scholar; and you recited the Qur'an to be marked as Qari (one who recites the Qur'an according to the rules). Then orders will be passed against him. So he will be dragged along on his face and thrown into Hell.
Third will be a man to whom Allah had made abundantly rich and granted him every kind of wealth. He will be brought for Judgment. Allah will let him know about His gifts conferred upon him in the world. He will recognize them. Then Allah will inquire: What did you with them? He will say: I left no way in which You like money to be spent without spending in it for Your sake. Allah will say: You are lying, You did so to be described as generous (in the society); (It means you got your reward in the world according to your intention). Now you deserve nothing in the Hereafter except Hell). So orders will be passed against him and he will be dragged along on his face until he will be hurled into Hell.
(This Hadith is sound and reported by Muslim and Nasa'i)
The purity of intention is behind any deed. If you spend for show, there is no reward. Eventually, if one loves another for something worldly this shall not count in the Hereafter. But love for the sake of Allah Assawajal is great virtue in the Hereafter. Such love can be a Muslim's love to learn from him or to take as a companion for good deeds, without any worldly considerations, once there is something worldly, the intention is not pure.
Taken from Darussalam
Saying of the Prophet Muhammad (s.a.w.s.) Having Allahs Statements
I hope that makes sence, and that I did not drive myself in circles 
