A passage from Marcus Aurelius
Marcus Aurelius, Meditations 4.49
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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.
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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If thou wouldst be at rest, do little. But it is better to do necessary things, and as many as the reason of a social animal requires, and as it requires.