There could be no justice, unless there were also injustice; no courage, unless there were cowardice; no truth, unless there were falsehood.

Chrysippus of Soli (279 BCE-206 BCE), Chrysippus of Soli was a Greek Stoic philosopher. He was a native of Soli, Cilicia, but moved to Athens as a young man, where he became a pupil of the Stoic philosopher Cleanthes. When Cleanthes died, around 230 BC, Chrysippus became the third head of the Stoic school.