Shaykh Ibn 'Uthaymeen
"If we carefully consider that which many of the du'aat are upon today, we find some of them are overcome by enthusiasm and as a result cause offence, such that the people have an aversion to their invitation (da'wah).
If they find someone doing something which is haraam, they make such a big thing of it and forcefully say: Don't you fear Allaah? or something similar to this, such that the person has an aversion to them, and this is not good because this is dealing with the issue in completely the opposite manner to that which is correct."
Kitaabul-'Ilm
"That he who has knowledge does not become tired in protecting it.
This is because, if Allaah bestows knowledge upon you, then its place is in the heart and there is no need for containers or keys or the like.
It is protected in the heart and soul, and in time itself it is a protector for you, because it protects you from danger, with Allaah’s permission.
So knowledge protects you, whilst with property, you protect it by placing it in locked up containers, and despite all this, you still remain insecure about it."
Kitaabul-'Ilm
"There is no comparison between one who has knowledge and one who does not, just as there is no comparison between the living and the dead, and one who hears and one who is deaf, and one who can see and one who is blind.
Knowledge is light with which one is guided, and with it removes one from the darkness (of ignorance) to the light (of knowledge, i.e. Islaam).
With knowledge, Allaah raises the ranks of whom He wishes from His creation:
{Allaah will exalt in degree those of you who believe, and those who have been granted knowledge}, [Soorah al-Mujaadalah, Aayah 11]."
Kitaabul-'Ilm
"There is no doubt, the more a person increases in knowledge, naturally he increases in learning and differentiating the truth from the falsehood, and the harmful from the beneficial, and like this he reaches a level whereby Allaah bestows understanding upon him.
This is because taqwa is a means for strengthening understanding, and strong understanding assists in increasing knowledge.
So you see two men memorising an aayah from the Book of Allaah, one of them can extract from it three rulings, whilst the other is able to extract more than this, according to that which Allaah has blessed him with in understanding."
Kitaabul-'Ilm
"So the expiation (of sins) is by good actions.
And this means that if a person fears Allaah (has taqwa), Allaah will make it easy for him to do good actions with which he can make expiation (for the sins)."
Kitaabul-'Ilm