Little enemies and little wounds must not be despised. – Proverb

It is not he who gives abuse that affronts, but the view that we take of it as insulting; so that when one provokes you it is your own opinion which is provoking. – Epictetus

I am returning this otherwise good typing paper to you because someone has printed gibberish all over it and put your name at the top. – English professor, Ohio University

Even rabbits insult an dead lion. – Proverb