•First kind of experience: the present impression doesn’t have this effect through its own power and efficacy, considered alone as a single perception and limited to the present moment. I find that an impression from which I can draw no conclusion when it first appears can later become a basis for a belief, after I have had experience of its usual consequences. ·For such a transition to occur·, we must in every case have observed the same ·sort of· impression in past instances, and have found that there is some other ·sort of· impression with which it is constantly conjoined. This is confirmed by such a multitude of events that there can’t be the slightest doubt about it.

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