Nothing outside the will can hinder or harm the will; it can only harm itself. If then we accept this, and, when things go amiss, are inclined to blame ourselves, remembering that judgment alone can disturb our peace and constancy, I swear to you by all the gods that we have made progress.
EpictetusMen are disturbed not by the things that happen, but by their opinion of the things that happen.
Epictetus