The idea of necessity arises from some impression. No impression conveyed by our ·outer· senses can give rise to it. So it must be derived from some internal impression, some impression of reflection. The only internal impression that has anything to do with the present business is ·the impression of· the propensity that custom produces in us to pass from an object to the idea of its usual attendant. This, therefore, is the essence of necessity. The bottom line is this:
necessity is something that exists in the mind, not in objects, and we can’t ever form the remotest idea of it considered as a quality in bodies. Either we have no idea of necessity, or necessity is nothing but the determination of the thought to pass from causes to effects (and vice versa) according to their experienced union.

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