If 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 TalibPerfecting one's intellect causes one to speak less, and those words spoken will be adorned with wisdom.
Ali ibn Abi TalibDo not be like those on whom advice has no effect and who require punishment to correct themselves.
Ali ibn Abi Talib