course in the Dark assures us of the Presence of some Person: Why? Because these are the Effects of the human Make and Fabric, and closely connected with it. If we anatomize all the other Reasonings of this Nature, we shall find, that they are founded on the Relation of Cause and Effect, and that this Relation is either near or remote, direct or collateral. Heat and Light are collateral Effects of Fire, and the one Effect may justly be infer'd from the other.
If we would satisfy ourselves, therefore, concerning the Nature of that Evidence, which assures us of all Matters of Fact, we must enquire how we arrive at the Knowledge of Causes and Effects.
I Shall venture to affirm, as a general Proposition, which admits of no Exception, that the Knowledge of this Relation of Cause and Effect is not, in any Instance, attain'd by Reasonings a priori; but arises entirely from Experience, when we find, that particular Objects are constantly conjoin'd with each other. Let any Object be presented to a Man of ever so strong natural Reason and Abilities; if that Object be entirely new to him, he will never be able, by the most accurate Examination of its sensible Qualities, to discover any of its Causes or Effects. Adam, tho' his rational Faculties be suppos'd, at the very first, ever so perfect, could not have infer'd from theFluidity
