4p63cd.md (395B)
1 Desire which springs from reason can only spring from 2 a pleasurable emotion, wherein the mind is not passive (III. 3 lix.), in other words, from a pleasure which cannot be excessive 4 (IV. lxi.), and not from pain; wherefore this desire springs 5 from the knowledge of good, not of evil (IV. viii.); hence under 6 the guidance of reason we seek good directly and only by 7 implication shun evil. Q.E.D. 8 9