Here, then, is a kind of pre-established harmony between the course of nature and the succesion of our ideas; and though the powers and forces, by which the former is governed, be wholly unknown to us; yet our thoughts and conceptions have still, we find, gone on in the same trainwith the other works of nature. Custom is that principle, by which this correspondence has been effected; so necessary to the subsistence of our species, and the regulation of our conduct, in every circumstance and occurence of human life.

David Hume, An Enquiry Concerning Human Understanding

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