3p42d.md (639B)
1 When a man loves something similar to himself, he 2 endeavours, as far as he can, to bring it about that he should be 3 loved thereby in return (III. xxxiii.). Therefore he who has 4 conferred a benefit confers it in obedience to the desire, which 5 he feels of being loved in return; that is (III. xxxiv.) from 6 the hope of honour or (III. xxx. note) pleasure; hence he will 7 endeavour, as far as he can, to conceive this cause of honour, or 8 to regard it as actually existing. But, by the hypothesis, he 9 conceives something else, which excludes the existence of the 10 said cause of honour: wherefore he will thereat feel pain (III. 11 xix.). Q.E.D. 12 13