3p37d.md (1170B)
1 Pain diminishes or constrains a man's power of 2 activity (III. xi. note), in other words (III. vii.), diminishes 3 or constrains the effort, wherewith he endeavours to persist in 4 his own being; therefore (III. v.) it is contrary to the said 5 endeavour: thus all the endeavours of a man affected by pain are 6 directed to removing that pain. But (by the definition of pain), 7 in proportion as the pain is greater, so also is it necessarily 8 opposed to a greater part of man's power of activity; therefore 9 the greater the pain, the greater the power of activity employed 10 to remove it; that is, the greater will be the desire or 11 appetite in endeavouring to remove it. Again, since pleasure 12 (III. xi. note) increases or aids a man's power of activity, it 13 may easily be shown in like manner, that a man affected by 14 pleasure has no desire further than to preserve it, and his 15 desire will be in proportion to the magnitude of the pleasure. 16 17 Lastly, since hatred and love are themselves emotions of pain 18 and pleasure, it follows in like manner that the endeavour, 19 appetite, or desire, which arises through hatred or love, will be 20 greater in proportion to the hatred or love. Q.E.D. 21 22