Epictetus

“Make the best use of what is in your power, and take the rest as it happens.”

“Men are disturbed not by the things which happen, but by the opinions about the things.”

“Seek not that the things which happen should happen as you wish; but wish the things which happen to be as they are, and you will have a tranquil flow of life.”

“No man is free who is not master of himself.”

“It's not what happens to you, but how you react to it that matters.”

“First say to yourself what you would be; and then do what you have to do.”