The unrestricted person, who has in hand what they will in all events, is free. But anyone who can be restricted, coerced, or pushed into something against what they will is a slave.” —EPICTETUS, DISCOURSES, 4.1.128b–129a

Holiday, Ryan; Hanselman, Stephen. The Daily Stoic: 366 Meditations on Wisdom, Perseverance, and the Art of Living (p. 81). Penguin Publishing Group. Kindle Edition.