Meditations 6.51:

“Ambition means tying your well-being to what other people say or do.
Self-indulgence means tying it to the things that happen to you.
Sanity means tying it to your own actions.”

You can’t control the weather. You can’t control what others say or do. You can’t control what happens to you.

But you can control your response to whatever happens.

Accept what happens. It’s futile, and ultimately harmful to your sanity, to resist what is. You don’t have to approve of what happens. You can just say to yourself, “Fascinating.” And then choose your action in response.

Welcome everything that happens, even bad things, as opportunities to grow and learn and get stronger.