P25: We strive to affirm, concerning ourselves and what we love, whatever we imagine to affect with Joy ourselves or what we love. On the other hand, we strive to deny whatever we imagine affects with Sadness ourselves or what we love.

Dem.: Whatever we imagine to affect what we love with Joy or Sadness, affects us with Joy or Sadness (by P21). But the Mind (by P12) strives as far as it can to imagine those things which affect us with Joy, i.e. (by IIP17) and P17 C), to regard them as present; and on the other hand (by P13) it strives to exclude the existence of those things which affect us with Sadness. Therefore, we strive to affirm, concerning ourselves and what we love, whatever we imagine to affect with Joy ourselves or what we love, and conversely, q.e.d.