You can be invincible, if you enter into no contest in which it is not in your power to conquer.
EpictetusDifficulty shows what men are. Therefore when a difficulty falls upon you, remember that God, like a trainer of wrestlers, has matched you with a rough young man. Why? So that you may become an Olympic conqueror; but it is not accomplished without sweat.
EpictetusWe need to regularly stop and take stock; to sit down and determine within ourselves which things are worth valuing and which things are not; which risks are worth the cost and which are not. Even the most confusing or hurtful aspects of life can be made more tolerable by clear seeing and by choice.
Epictetus