4p35d.md (1071B)
1 In so far as men are assailed by emotions that are 2 passions, they can be different in nature (IV. xxxiii.), and at 3 variance one with another. But men are only said to be active, 4 in so far as they act in obedience to reason (III. iii.); 5 therefore, what so ever follows from human nature in so far as it 6 is defined by reason must (III. Def. ii.) be understood solely 7 through human nature as its proximate cause. But, since every 8 man by the laws of his nature desires that which he deems good, 9 and endeavours to remove that which he deems bad (IV. xix.); and 10 further, since that which we, in accordance with reason, deem 11 good or bad, necessarily is good or bad (II. xli.); it follows 12 that men, in so far as they live in obedience to reason, 13 necessarily do only such things as are necessarily good for human 14 nature, and consequently for each individual man (IV. xxxi. 15 Coroll.); in other words, such things as are in harmony with 16 each man's nature. Therefore, men in so far as they live in 17 obedience to reason, necessarily live always in harmony one with 18 another. Q.E.D. 19 20