3p2d.md (818B)
1 All modes of thinking have for their cause God, by 2 virtue of his being a thinking thing, and not by virtue of his 3 being displayed under any other attribute (II. vi.). That, 4 therefore, which determines the mind to thought is a mode of 5 thought, and not a mode of extension; that is (II. Def. i.), it 6 is not body. This was our first point. Again, the motion and 7 rest of a body must arise from another body, which has also been 8 determined to a state of motion or rest by a third body, and 9 absolutely everything which takes place in a body must spring 10 from God, in so far as he is regarded as affected by some mode of 11 extension, and not by some mode of thought (II. vi.); that is, 12 it cannot spring from the mind, which is a mode of thought. This 13 was our second point. Therefore body cannot determine mind, &c. 14 Q.E.D. 15 16