It's not what happens to you, but how you react to it that matters.
No man is free who is not master of himself.
Your master is he who controls that on which you have set your heart or wish to avoid.
You may fetter my leg, but Zeus himself cannot get the better of my free will.
Renew every day your conversation with God: Do this even in preference to eating. Think more often of God than you breathe.
It is not he who reviles or strikes you who insults you, but your opinion that these things are insulting.