Letter 76 — On Learning Wisdom in Old Age (§11)

“Hence that in man is alone a good which alone belongs to man. For we are not now seeking to discover what is a good, but what good is man’s. And if there is no other attribute which belongs peculiarly to man except reason, then reason will be his one peculiar good, but a good that is worth all the rest put together. If any man is bad, he will, I suppose, be regarded with disapproval; if good, I suppose he will be regarded with approval. Therefore, that attribute of man whereby he is approved or disapproved is his chief and only good.”