فإذا لم تقتل النّفس بصدق المجاهدة فلن يحيا قلبك بأنوار المعرفة. - Al-Ghazali

People only see the outward, while God sees both the outer and the inner man. He who really believes this will have both his outer and inner being well disciplined. If he disbelieve it, he is an infidel, and if, while believing it, he acts contrary to that belief, be is guilty of the grossest.

Knowledge without work is insanity, and work without knowledge is vanity. Know that any science which does not remove you today far from apostasy, and does not carry you to obedience, will not remove you tomorrow from the fire of hell.

O youth.......be assured that knowledge alone does not strengthen the hand......Though a man read a hundred thousand scientific questions and understood them or learned them, but did not work with them — -They do not benefit him except by working.....Knowledge is the tree, and working is its fruit; and though you studied a hundred years and assembled a thousand books, you would not be prepared for the mercy of Allah the Exalted except by working.