العمل بالعلم وتبليغه:قال الذهبي رحمه الله: من طلب العلمَ للعمل كسره العلمُ، وبكى على نفسه، ومن طلب العلم للمدارس والإفتاء والفخر والرياء، تحامق، واختال، وازدرى بالناس وأهلكه العُجْبُ، ومقتَتْهُ الأنفس " قَدْ أَفْلَحَ مَن زَكَّاهَا، وَقَدْ خَابَ مَن دَسَّاهَا " [الشمس: 9، 10]؛ أي: دسَّسَها بالفُجور والمعصية. قُلِبتْ فيه السينُ ألفًا. [السير (تهذيبه) 3/1401].
Acting upon and conveying knowledge: Al-Dhahabi, may God have mercy on him, said: “Whoever seeks knowledge to act upon it, knowledge will humble him, and he will weep for himself. But whoever seeks knowledge for the sake of schools, issuing fatwas, boasting, and showing off, will become foolish, arrogant, and will look down upon people. Conceit will destroy him, and people will despise him. ‘He has certainly succeeded who purifies it, and he has certainly failed who corrupts it’ [Ash-Shams: 9-10]; that is, he corrupts it with immorality and disobedience. The letter ‘seen’ in it has been changed to ‘alif’.” [Siyar (its abridgment) 3/1401].