Full Idea
We say we get nearer to root-2 by adding further figures after the decimal point: 1.1412.... This suggests there is something we can get nearer to, but the analogy is a false one.
Gist of Idea
We don't get 'nearer' to something by adding decimals to 1.1412... (root-2)
Source
Ludwig Wittgenstein (Lectures 1930-32 (student notes) [1931], Notes)
Book Reference
Wittgenstein,Ludwig: 'Lectures in Cambridge 1930-32', ed/tr. Lee,Desmond [Blackwell 1980], p.114