Page:An Enquiry Concerning Human Understanding - Hume (1748).djvu/115

 lectual View? Produce the Impressions or original Sentiments, from which the Ideas are copy'd. These Impressions are all strong and sensible. They admit not of Ambiguity and Obscurity. They are not only plac'd in a full Light themselves, but may throw Light on their correspondent Ideas, which lie in Obscurity. And by this Means, we may, perhaps, attain a new Microscope or Species of Optics, by which, in the moral Sciences, the most minute and most simple Ideas, may be so enlarg'd as to fall readily under our Apprehension, and be equally known with the grossest and most sensible Objects, that can be the Subjects of our Disquisition and Enquiry.

be fully acquainted, therefore, with the Idea of Power or necessary Connexion, let us examine its Impression; and in order to find that with greater Certainty, let us search for all the Sources, from which it may possibly be deriv'd.

we look about us towards external Objects, and consider the Operation of Causes, we are never able, in any single Instance, to discover any Power or necessary Connexion; any Quality, which binds the Effect to the Cause, and renders the one an infallible Consequence of the other. We only find, that the one does actually, in fact, follow the other. The Impulse of one Billiard-Ball is attended with Motion