Knowledge is of two kinds: that which is absorbed and that which is heard. And that which is heard does not profit if it is not absorbed.
Ali ibn Abi TalibGreed takes a person to the watering place but gets him back without letting him drink. It undertakes responsibility but does not fulfill it. Often the drinker gets choked before quenching his thirst. The greater the worth of a thing yearned for, the greater is the grief for its loss. Desires blind the eyes of understanding. The destined share would reach him who does not approach it.
Ali ibn Abi TalibHe who busies himself with things other than improvement of his own self becomes perplexed in darkness and entangled in ruin. His evil spirits immerse him deep in vices and make his bad actions seem handsome.
Ali ibn Abi Talib