A passage from Marcus Aurelius
Marcus Aurelius, Meditations 10.3
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Everything which happens either happens in such wise as thou art formed by nature to bear it, or as thou art not formed by nature to bear it. If, then, it happens to thee in such way as thou art formed by nature to bear it, do not complain, but bear it as thou art formed by nature to bear 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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Your present opinion founded on understanding, your present conduct directed to social good, your present disposition contented with everything that happens — that is enough.