An insincere and evil friend is more to be feared than a wild beast; a wild beast may wound your body, but an evil friend will wound your mind.
Do not overrate what you have received, nor envy others. He who envies others does not obtain peace of mind.
Holding on to anger is like grasping a hot coal with the intent of throwing it at someone else; you are the one who gets burned.
However many holy words you read, however many you speak, what good will they do you if you do not act on upon them?