A passage from Marcus Aurelius
Marcus Aurelius, Meditations 7.9
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All things are implicated with one another, and the bond is holy... For there is one common world made up of all things, and one God who pervades all things.
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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It is a man's special privilege to love even those who wrong him.
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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.