We are not disturbed by what happens to us, but by our thoughts about what happens to us.
If we are not stupid or insincere when we say that the good or ill of man lies within his own will, and that all beside is nothing to us, why are we still troubled?
Seek not the good in external things;seek it in yourselves.
Man is troubled not by events, but by the meaning he gives them.
No man is free who is not master of himself.
Men are not troubled by things themselves, but by their thoughts about them