Full Idea
'Infinite' is not an answer to the question 'How many?', since the infinite is not a number. ...Infinity is the property of a law, not of an extension.
Gist of Idea
Infinity is not a number, so doesn't say how many; it is the property of a law
Source
Ludwig Wittgenstein (Lectures 1930-32 (student notes) [1931], A VII.2)
Book Reference
Wittgenstein,Ludwig: 'Lectures in Cambridge 1930-32', ed/tr. Lee,Desmond [Blackwell 1980], p.13