A passage from Seneca
Seneca, Letters to Lucilius Letter 91
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He robs present ills of their power who has perceived their coming beforehand.
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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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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Be like the promontory against which the waves continually break, but it stands firm and tames the fury of the water around it.