Full Idea
Von Neumann's Limitation of Size axiom is not self-evident, and he himself admitted that it seemed too strong.
Gist of Idea
Limitation of Size is not self-evident, and seems too strong
Source
comment on John von Neumann (An Axiomatization of Set Theory [1925]) by Shaughan Lavine - Understanding the Infinite VII.1
Book Reference
Lavine,Shaughan: 'Understanding the Infinite' [Harvard 1994], p.215