Readiest among the principles to which you look let there be these two: Firstly, things external do not touch the soul, but remain powerless without; and all trouble comes from what we think of them within. Secondly, all things visible change in a moment, and are gone for ever. Recollect all the changes of which you have yourself been a witness. The world is a succession of changes: life is but thought.
Complete Works Of Marcus Aurelius. Illustrated
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Marcus Aurelius
