“For none is free but Zeus.”
Source: Prometheus Bound, line 50 (tr. Henry David Thoreau)
Original
Ἐλεύθερος γὰρ οὔτις ἐστὶ πλὴν Διός.
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Aeschylus 119
ancient Athenian playwright -525–-456 BCRelated quotes

“None but the dead have free speech.”
Source: Mark Twain's Notebook (1935), p. 393

“Zeus, first cause, prime mover; for what thing without Zeus is done among mortals?”
Source: Oresteia (458 BC), Agamemnon, line 1485

“Oh but if Zeus's lightning blinded us those days,
it's Zeus who drives us, hurls us on today!”
XV. 724–725 (tr. Robert Fagles).
Iliad (c. 750 BC)

“None can be free who is a slave to, and ruled by, his passions.”
As quoted in Florilegium, XVIII, 23, as translated in Dictionary of Quotations (1906) by Thomas Benfield Harbottle, p. 368
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
Florilegium

“But the will of Zeus will always overpower the will of men.”
XVI. 688 (tr. Robert Fagles).
Iliad (c. 750 BC)

“The will of Zeus,
The hand of his Hephæstus.”
Source: Prometheus Bound, line 619 (tr. Elizabeth Barrett Browning)