In nineteenth-century America, a boy who thought he was pretty tough would put a wood chip on his shoulder and dare anyone to knock it off.
Proverbs are pieces of brief and popular sayings, generally in the form of a phrase.
Do unto others as you would have them do unto you Meaning: Treat people the same way you want to be treated.
Easy come, easy go.
That is the pot calling the kettle black.
Remember, all that glitters is not gold.