A passage from Chrysippus
Chrysippus, Fragments (in Diogenes Laërtius) Lives 7.39
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The universe is a coherent whole, and the events in it are linked together by unbreakable chains of cause and effect. This is the foundation of fate.
Related passages
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Your present opinion founded on understanding, your present conduct directed to social good, your present disposition contented with everything that happens — that is enough.
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He who acts unjustly acts impiously. For since the universal nature has made rational animals for the sake of one another, he who acts contrary to nature commits impiety against the highest divinity.
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From Sextus, a benevolent disposition, and the example of a family governed in a fatherly manner, and the idea of living conformably to nature; and gravity without affectation.