 Ramsey (1931) was less sceptical than Russell (1913) and Wittgenstein (1922) about the prospect of an analysis of causation. His account of causation seems to be the logical empiricist analysis that comes closest to Hume’s original analysis. It is centred on the notion of a variable hypothetical. Such a hypothetical is a universally quantified implication that has instances whose truth or falsity we are unable to verify for now. A case in point is the sentence saying that all humans are mortal. This sentence goes beyond our finite experience. For there is no way to conclusively establish that all men—past, present and future—are mortal.