But yet, if we will consider it attentively, bodies, by our senses, do not afford us so clear and distinct an idea of active power, as we have from reflection on the operations of our minds.

For all power relating to action, and there being but two sorts of action whereof we have an idea, viz.

thinking and motion, let us consider whence we have the clearest ideas of the powers which produce these actions.

(1) Of thinking, body affords us no idea at all; it is only from reflection that we have that.
(2) Neither have we from body any idea of the beginning of motion.

A body at rest affords us no idea of any active power to move; and when it is set in motion itself, that motion is rather a passion than an action in it.