Full Idea
Maddy says that intuition alone does not support very much mathematics; more importantly, a naturalist cannot accept intuition at face value, but must ask why we are justified in relying on intuition.
Gist of Idea
Intuition doesn't support much mathematics, and we should question its reliability
Source
report of Penelope Maddy (Realism in Mathematics [1990]) by Stewart Shapiro - Thinking About Mathematics 8.3
Book Reference
Shapiro,Stewart: 'Thinking About Mathematics' [OUP 2000], p.224
A Reaction
It depends what you mean by 'intuition', but I identify with her second objection, that every faculty must ultimately be subject to criticism, which seems to point to a fairly rationalist view of things.