5p28d.md (667B)
1 This proposition is self–evident. For whatsoever we 2 understand clearly and distinctly, we understand either through 3 itself, or through that which is conceived through itself; that 4 is, ideas which are clear and distinct in us, or which are 5 referred to the third kind of knowledge (II. xl. note. ii.) 6 cannot follow from ideas that are fragmentary and confused, and 7 are referred to knowledge of the first kind, but must follow from 8 adequate ideas, or ideas of the second and third kind of 9 knowledge; therefore (Def. of the Emotions, i.), the desire of 10 knowing things by the third kind of knowledge cannot arise from 11 the first, but from the second kind. Q.E.D. 12 13