Full Idea
If God is only an object of man, what is revealed to us in his essence? Nothing but the essence of man.
Gist of Idea
If God is only an object for man, then only the essence of man is revealed in God
Source
Ludwig Feuerbach (Principles of Philosophy of the Future [1843], §07)
Book Reference
Feuerbach,Ludwig: 'Principles of the Philosophy of the Future', ed/tr. Vogel,M [Hackett 1986], p.10
A Reaction
It is important to distinguish here between what we could know about God, and what we think God might actually be like. We may well only be able to read the essence of man into God, but we might speculate that God is more than that.