We live by the assumption that what's good for us is good for the world. And this is based on the even flimsier assumption that we could know with any certainty what's good for us.

Stoicism stressed the search for inner peace and ethical certainty despite the apparent chaos of the external world by emulating in one's personal conduct the underlying orderliness and lawfulness of nature.

The actual facts of morality are too much on my side for me to fear that my theory can ever be replaced or upset by any other.