Happiness and freedom begin with a clear understanding of one principle: Some things are within our control, and some things are not. It is only after you have faced up to this fundamental rule and learned to distinguish between what you can and can't control that inner tranquility and outer effectiveness become possible.
EpictetusIf you would improve, submit to be considered wihout sense and foolish with respect to externals. Wish to be considered to know nothing; and if you shall seem to someone to be a person of importance, distrust yourself.
Epictetus