We may observe, that in these Phænomena the Belief of the correlative Object is always pre-suppos'd; without which the Relation could have no Effect in inlivening the Idea. The Influence of the Picture supposes, that we believe our Friend to have once existed. Contiguity to Home can never excite our Ideas of Home, unless we believe that it really exists. Now I assert, that this Belief, where it reaches beyond the Memory or Senses, is of a similar Nature, and arises from similar Causes, with the Transition of Thought and Vivacity of Conception here explain'd. When I throw a Piece of dry Wood into a Fire, my Mind is immediately carry'd to conceive, that its augments, not extinguishes the Flame. This Transition of Thought from the Cause to the Effect proceeds not from Reason. It derives its Origin altogether from Custom and Experience. And as it first begins from an Object, present to the Senses, it renders the Idea or Conception of Flame more strong and lively than any loose, floating Reverie of the Imagination. That Idea arises immediately. The Thought passes instantly to it, and conveys to it all that Force of Conception, which is deriv'd from the Impression present to the Senses. When a Sword is level'd at my Breast, does not the Idea of Wound and Pain strike me more strongly, than when a Glass of Wine is presented to me, even tho' by Accident this Idea should be pre-sented
