From causes which appear similar, we expect similar effects. This is the sum total of all our experimental conclusions.
David HumeAll sentiment is right; because sentiment has a reference to nothing beyond itself, and is always real, wherever a man is conscious of it. But all determinations of the understanding are not right; because they have a reference to something beyond themselves, to wit, real matter of fact; and are not always conformable to that standard.
David Hume