A passage from Marcus Aurelius
Marcus Aurelius, Meditations 3.13
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Just as we must understand, when it is said, It is the will of Asclepius, that it is the will of Asclepius that something shall be, so too we must understand, when it is said, It is the will of nature, that it is the will of nature that something shall be.
Related passages
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Take away thy opinion, and then there is taken away the complaint, 'I have been harmed.' Take away the complaint, and the harm is taken away.
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If you are distressed by anything external, the pain is not due to the thing itself, but to your estimate of it; and this you have the power to revoke at any moment.
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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.