its essence is explained or defined by the essence of its cause.
(This axiom is evident from III. vii.)
PROPOSITIONS.
PROP. I. Even as thoughts and the ideas of things are arranged and associated in the mind, so are the modifications of body or the images of things precisely in the same way arranged and associated in the body.
Proof.—The order and connection of ideas is the same (II. vii.) as the order and connection of things, and vice versâ the order and connection of things is the same (II. vi. Coroll. and vii.) as the order and connection of ideas. Wherefore, even as the order and connection of ideas in the mind takes place according to the order and association of modifications of the body (II. xviii.), so vice versâ (III. ii.) the order and connection of modifications of the body takes place in accordance with the manner, in which thoughts and the ideas of things are arranged and associated in the mind. Q.E.D.
PROP. II. If we remove a disturbance of