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2. Secondly, It extends no further than we can perceive their agreement or disagreement.

Secondly, That we can have no knowledge further than we can have perception of that agreement or disagreement. Which perception being: 1. Either by intuition, or the immediate comparing any two ideas; or, 2. By reason, examining the agreement or disagreement of two ideas, by the intervention of some others; or, 3. By sensation, perceiving the existence of particular things: hence it also follows: