A passage from Seneca
Seneca, Letters to Lucilius Letter 13
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We suffer more often in imagination than in reality.
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.