When you see anyone complaining of such and such a person's ill-nature and bad temper, know that the complainant is bad-tempered, forasmuch as he speaks ill of that bad-tempered person, because he alone is good-tempered who is quietly forbearing towards the bad-tempered and ill-natured. Rumi
Firstly you must always implicitly obey orders, without attempting to form any opinion of your own regarding their propriety. Secondly, you must consider every man your enemy who speaks ill of your king; and thirdly you must hate a Frenchman as you hate the devil. Horatio Nelson
My dear Tiberius, you must not give way to youthful emotion or take it to heart if anyone speaks ill of me; let us be satisfied if we can make people stop short at unkind words. Augustus
He who speaks ill of himself is praised by no one. Danish Proverb
Who speaks ill of others to you will speak ill of you to others. German Proverb
He that speaks ill of the mare would buy her. English Proverb