Imam Ali (as): Imam Ali (AS) said to Jabir ibn 'Abdullah al-Ansari': O Jabir, the mainstay of religion and the world are four persons: The scholar who acts on his knowledge; the ignorant who does not refrains from learning; the generous who is not niggardly in his favors; and the destitute who does not sell his next life for his worldly benefits. Consequently, when the scholar wastes his knowledge [and does not act upon it], the ignorant refrains from learning, and when the generous is niggardly with his favors, the destitute sells his next life for worldly benefits. " Nahj al-Balāgha