Men at some time are masters of their fates The fault, dear Brutus, is not in our stars, But in ourselves, that we are underlings.
Source documented
From William Shakespeare’s Julius Caesar, Act 1, Scene 2. Cassius tells Brutus that their subordinate position comes from their own actions rather than fate, as he seeks to turn Brutus against Caesar. Verified against the Folger Shakespeare Library’s text. Folger Shakespeare Library