Full Idea
In the ontological argument a deep enough understanding of the very concept of God allows one to derive by logic a contradiction from the statement 'There is no God'.
Gist of Idea
In the ontological argument a full understanding of the concept of God implies a contradiction in 'There is no God'
Source
José A. Benardete (Metaphysics: the logical approach [1989], Ch. 4)
Book Reference
Benardete,José A.: 'Metaphysics: The Logical Approach' [OUP 1989], p.21