To be free from evil thoughts is Gods best gift. – Aeschylus

A man is relieved and gay when he has put his heart into his work and done his best but what he has said or done otherwise shall give him no peace. – Ralph Waldo Emerson

The key is to keep company only with people who uplift you, whose presence calls forth your best. – Epictetus

Theres a victory, and defeat the first and best of victories, the lowest and worst of defeats which each man gains or sustains at the hands not of another, but of himself. – Plato