The question whether “He can continue … ” means the same as “He knows the formula” can be answered in several different ways: We can say, “They don't mean the same, i.e., they are not in general used as synonyms as, e.g., the phrases, ‘I am well’ and ‘I am in good health’”; or we may say, “Under certain circumstances” ‘He can continue … ’ means he knows the formula”. Imagine the case of a language (somewhat analogous to 49)) in which two forms of expression, two different sentences, are used to say that a person's legs are in working order. The one form of expression is exclusively used under circumstances when preparations are going on for an expedition, a walking tour, or the like; the other is used in cases when there is no question of such preparations. We shall here be doubtful whether to say the two sentences have the same meaning or different meanings. In any case the true state of affairs can only be seen when we look into the detail of the usage of our expressions. ‒ ‒ And it is clear that if in our present case we should decide on saying || to say that the two expressions have different meanings, we shall certainly not be able to say that the difference is that the fact which makes the second sentence true is a different one from the fact which makes the first sentence true.