A passage from Marcus Aurelius
Marcus Aurelius, Meditations 4.38
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Whatever may happen to thee, it was prepared for thee from eternity; and the implication of causes was from eternity spinning the thread of thy being, and of all things that are connected with thee.
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.