To begin in an orderly fashion, we must consider the idea of causation and see from what origin it is derived. It is impossible •to reason soundly without understanding perfectly the idea about which we reason; and it is impossible •to understand an idea perfectly without tracing it back to its origin and examining the primary impression from which it arises. •The examination of the impression gives clearness to the idea, and •the examination of the idea gives a similar clearness to all our reasoning.

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