A passage from Diogenes Laertius
Diogenes Laertius, Lives of Eminent Philosophers 7.88
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Zeno defined nature as the artistically working fire, proceeding by method toward the production of things. This is the rational principle that governs the universe.
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.