Evdokimov's "Proof"

Paul Evdokimov, Les Ages de la vie spirituelle, on knowledge of God (quoted by J. A. McGuckin in The Orthodox Church):

The insufficiency of the proofs for the existence of God can be explained by the basic fact that God alone is the criterion of his own truth. God alone is the argument for his own being. God can never be the subject of logical demonstrations, or enclosed in chains of causality…This means that faith is never invented: it is always a gift.