3p55d.md (458B)
1 The essence of the mind only affirms that which the mind is, or can do; in other 2 words, it is the mind's nature to conceive only such things as assert its power 3 of activity (last Prop.). Thus, when we say that the mind contemplates its own 4 weakness, we are merely saying that while the mind is attempting to conceive 5 something which asserts its power of activity, it is checked in its 6 endeavour-—in other words (III. xi. note), it feels pain. Q.E.D. 7 8