A passage from Epictetus
Epictetus, Discourses I.19
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Every animal is so constituted that it flees from and turns from the things that appear harmful and the things that cause the harm.
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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The soul becomes dyed with the color of its thoughts.