None can be free who is a slave to, and ruled by, his passions.
Notes from Wikiquote
No one is free who has not obtained the empire of himself. | As translated by Nicholas Rowe(1732) | No man is free who cannot command himself. | As quoted in Moral Encyclopaedia, Or, Varlé's Self-instructor, No. 3 (1831) by by Charles Varle | No man is free who cannot control himself. | As quoted in 25 Days to Better Thinking and Better Living: A Guide for Improving Every Aspect of Your Life (2006) by Linda Elder and Richard Paul