Ali Ibn Abi Talib said this quote

The moment you start arguing with an ignorant fool, you have already lost.

~ Ali Ibn Abi Talib

I am amazed at the heart of man: It possesses the substance of wisdom as well as the opposites contrary to it ... for if hope arises in it, it is brought low by covetousness: and if covetousness is aroused in it, greed destroys it. If despair possesses it, self piety kills it: and if it is seized by anger, this is intensified by rage. If it is blessed with contentment, then it forgets to be careful; and if it is filled with fear, then it becomes preoccupied with being cautious. If it feels secure , then it is overcome by vain hopes; and if it is given wealth, then its independence makes it extravagant. If want strikes it, then it is smitten by anxiety. If it is weakened by hunger, then it gives way to exhaustion; and if it goes too far in satisfying its appetites, then its inner becomes clogged up. So all its shortcomings are harmful to it, and all its excesses corrupt it.

~ Ali Ibn Abi Talib

There is no wealth like knowledge, no poverty like ignorance.

~ Ali Ibn Abi Talib

If what you achieve today is equal to what you achieved yesterday, then you are at a loss. And if what you have achieved today is less than what you achieved yesterday, then you are deprived from the Almighty's blessings. Anyone who is not progressing, is in fact regressing, and if you are regressing, then you might as well be dead.

~ Ali Ibn Abi Talib