Now, as all objects which are not contrary are susceptible of a constant conjunction, and as no real objects are contrary, I have inferred from these principles (Part III.Sec.

15) that, to consider the matter _a priori_, anything may produce anything, and that we shall never discover a reason why any object may or may not be the cause of any other, however great, or however little, the resemblance may be betwixt them.

This evidently destroys the precedent reasoning, concerning the cause of thought or perception.

For though there appear no manner of connection betwixt motion and thought, the case is the same with all other causes and effects.

Place one body of a pound weight on one end of a lever, and another body of the same weight on the other end; you will never find in these bodies any principle of motion dependent on their distance from the centre, more than of thought and perception.