Musonius Rufus · Fragments
Fragment 24
If one were to measure what is agreeable by the standard of pleasure, nothing would be pleasanter than self-control; and if one were to measure what is to be avoided by pain, nothing would be more painful than lack of self-control.1
Musonius Rufus, Lectures and Fragments, Fragment 24, translated by Cora E. Lutz (1947). The Stoic Library.