Full Idea
Too much of mathematics is rejected by the constructivist.
Gist of Idea
Constructivism rejects too much mathematics
Source
Michèle Friend (Introducing the Philosophy of Mathematics [2007], 5.1)
Book Reference
Friend,Michèle: 'Introducing the Philosophy of Mathematics' [Acumen 2007], p.106
A Reaction
This was Hilbert's view. This seems to be generally true of verificationism. My favourite example is that legitimate speculations can be labelled as meaningless.