St. George William Joseph Stock, A Guide to Stoicism
“ To say that "Virtue is the highest good" is a proposition to which every one who aspires to the spiritual life must yield assent with his lips, even if he has not yet learned to believe it in his heart. But alter it into "Virtue is the only good" and by that slight change it becomes at once the teeming mother of paradoxes. By a paradox is meant that which runs counter to general opinion. Now it is quite certain that men have regarded, do regard, and, we may safely add will regard things as good which are not virtue. ”
