A passage from Marcus Aurelius
Marcus Aurelius, Meditations 8.50
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A cucumber is bitter. Throw it away. There are briars in the road. Turn aside from them. This is enough. Do not add, 'And why were such things made in the world?'
Related passages
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Begin the morning by saying to thyself, I shall meet with the busy-body, the ungrateful, arrogant, deceitful, envious, unsocial.
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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.