Letters 95.6

It is also said: “If honourable conduct results from precepts, then precepts are amply sufficient for the happy life; but the first of these statements is true; therefore the second is true also.” We shall reply to these words that honourable conduct is, to be sure, brought about by precepts, but not by precepts alone.

Seneca, Letters to Lucilius 95.6, translated by Richard Mott Gummere