 He also announces that, when a system starts in an improbable state, it will always evolve towards more probable states, until it reaches the most probable state, i.e. that of thermal equilibrium. When this is applied to the Second Law, he says, “we can identify that quantity which is usually called entropy, with the probability of the state in question.” And: “According to the present interpretation, [the Second Law] states nothing else but that the probability of the total state of a composite system always increases” [W.A. II, pp. 165–6]. Exactly how all this is meant, he says, will become clear later in the article.