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It is impossible, therefore, that the character of natural and unnatural can ever, in any sense, mark the boundaries of vice and virtue. In the former example, my perceptions in the apprehension of a house might begin at the roof and end at the foundation, or vice versa; or I might apprehend the manifold in this empirical intuition, by going from left to right, and from right to left. To which we may add, that this agreement or disagreement, not admitting of degrees, all virtues and vices would of course be equal. Why we annex the idea of virtue to justice, and of vice to injustice.