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.
Al-GhazaliHe who does not arrive at the Intuition of these Truths by means of Ecstasy knows only the name of Inspiration.
Al-Ghazali