Plato said that virtue has no master. If a person does not honor this principle and rejoice in it, but is purchasable for money, he creates many masters for himself.
Apollonius of Tyana (c. AD 15-100) Greek philosopher and religious leader [Ἀπολλώνιος]
Letters from Apollonius of Tyana, ep. 15, Letter to Euphrates [tr. Jones (2006)]
(Source)
The reference to Plato's Republic, X 617 E.
Quotations about:
mercenary
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MAL: How come you didn’t turn on me, Jayne?
JAYNE: Money wasn’t good enough.
MAL: What happens when it is?
JAYNE: Well, that’ll be an interesting day.
MAL: I imagine it will.