3p58d.md (736B)
1 When the mind conceives itself and its power of 2 activity, it feels pleasure (III. liii.): now the mind 3 necessarily contemplates itself, when it conceives a true or 4 adequate idea (II. xliii.). But the mind does conceive certain 5 adequate ideas (II. xl. note 2.). Therefore it feels pleasure in 6 so far as it conceives adequate ideas; that is, in so far as it 7 is active (III. i.). Again, the mind, both in so far as it has 8 clear and distinct ideas, and in so far as it has confused ideas, 9 endeavours to persist in its own being (III. ix.); but by such 10 an endeavour we mean desire (by the note to the same Prop.); 11 therefore, desire is also attributable to us, in so far as we 12 understand, or (III. i.) in so far as we are active. Q.E.D. 13 14