A passage from Marcus Aurelius
Marcus Aurelius, Meditations 8.22
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Direct thy attention to what is said. Let thy understanding enter into the things that are doing and the things which do them.
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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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Waste no more time arguing what a good man should be. Be one.