Thus, just as •the necessity that makes twice two equal four … . lies only in •the act of the understanding by which we consider and compare these ideas, so also •the necessity or power that unites causes with effects lies in •the determination of the mind to pass from the one to the other. The efficacy or energy of causes doesn’t belong to the causes themselves or to God or to the two together; it belongs entirely to the mind that considers the union of two or more objects in all past instances. It is here that the real power of causes is placed, along with their connection and necessity.

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