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 Sides, and at last dismiss it for some other Idea, when we think, that we have survey'd it with sufficient Accuracy? I believe the same Arguments will prove, that even this Command of the Will gives us no real Idea of Force or Energy.

First, It must be allow'd, that when we know a Power, we know that very Circumstance in the Cause, by which it is enabled to produce the Effect: For these are suppos'd to be synonimous. We must, therefore, know both the Cause and Effect, and the Relation betwixt the one and the other. But do we pretend to be acquainted with the Nature of the human Soul and the Nature of an Idea, or the Aptitude of the one to produce the other? This is a real Creation; a Production of something out of nothing: Which implies a Power so great, that it may seem, at first Sight, beyond the Reach of any Being, less than infinite. At least, it must be own'd, that such a Power is not felt, nor known, nor even conceivable by the Mind. We only feel the Event, viz. the Existence of an Idea, consequent to a Command of the Will: But the Manner, by which this Operation is persorm'd; the Power, by which it is produc'd; is entirely beyond our Comprehension.

Secondly, The Command of the Mind over itself is limited, as well as its Command over the Body; and