4p24d.md (388B)
1 To act absolutely in obedience to virtue is nothing 2 else but to act according to the laws of one's own nature. But 3 we only act, in so far as we understand (III. iii.): therefore 4 to act in obedience to virtue is in us nothing else but to act, 5 to live, or to preserve one's being in obedience to reason, and 6 that on the basis of seeking what is useful for us (IV. xxii. 7 Coroll.). Q.E.D. 8 9