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Epictetus: "We should discipline ourselves in small things, and from there progress to things of greater value. If you have a headache, practice not cursing. Don’t curse every time you have an earache... Walk upright and free, trusting in the strength of your moral convictions, not the strength of your body, like an athlete. You weren’t meant to be invincible by brute force, like a pack animal. You are invincible if nothing outside the will can disconcert you." 

Don't let losses sway your judgements.