A passage from Hierocles
Hierocles, Elements of Ethics 1.10
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The end of life is to live in accordance with nature and reason. This is the perfection of the rational animal, and the only true happiness.
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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Every nature is contented with itself when it goes on its way well; and a rational nature goes on its way well, when in its thoughts it assents to nothing false or uncertain.
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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.