Full Idea
If there were gods, how could I endure not to be a god! Therefore there are no gods. ...For what would there be to create if gods - existed!
Gist of Idea
There can't be gods, because that leaves us nothing to create!
Source
Friedrich Nietzsche (Thus Spake Zarathustra [1884], 2.02)
Book Reference
Nietzsche,Friedrich: 'Thus Spake Zarathustra', ed/tr. Hollingdale,R.J. [Penguin 1969], p.110
A Reaction
[Zarathustra says this, not Nietzsche!]