One might perhaps suggest that the only case in which it is correct to say, without restriction, that I can do a certain

63.

thing, is that in which while saying that I can do it, I actually do it, and that otherwise I ought to say, “I can do it as far as … is concerned”. One may be inclined to think that only in the above case has a person given a real proof of being able to do a thing.
65). But if we look at a language-game in which the phrase “I can … ” is used in this way (e.g., a game in which doing a thing is taken as the only justification for saying that one is able to do it), we see that there is not the metaphysical difference between this game and one in which other justifications are accepted for saying “I can do so-and-so”. A game of the kind 65), by the way, shows us the real use of the phrase, “If something happens it certainly can happen”; an almost useless phrase in our language. It sounds as though it had some very clear and deep meaning, but like most of the general philosophical propositions it is meaningless except in very special cases.
66). Make this clear to yourself by imagining a language (similar to 49)) which has two expressions for such sentences as, “I am lifting a fifty pound weight”; one expression is used whenever the action is performed as a test (say, before an athletic competition), the other expression is used when the action is not performed as a test.

(2015–) Wittgenstein Source Bergen Nachlass Edition (WS-BNE). Edited by the Wittgenstein Archives at the University of Bergen under the direction of Alois Pichler. In: Wittgenstein Source, curated by Alois Pichler (2009–) and Joseph Wang-Kathrein (2020–). (N) Bergen: WAB.