When proven wrong, the wise man will correct himself and the ignorant will keep arguing.
Ali ibn Abi TalibIf you find that somebody is not grateful for all that you have done for him, then do not get disappointed because often you will find that someone else feels under your obligation though you have done nothing for him and thus your good deeds will be compensated, and Allah will reward you for your goodness.
Ali ibn Abi TalibDo not use the sharpness of your speech on your mother who taught you how to speak.
Ali ibn Abi Talib