Proof (n.) offered for what faith already holds is either wretched or humorous: the faithful man, seeing reflection about to prove God, washes his hands with flint-soap — "if this is not convincing, I despair of producing any."
Proof (n.) demanded by the betrayed is not wanted for convincing: demanding a proof is an amelioration, and the uncertainty is refreshing — she wants the improbable excuse precisely because it is improbable.
Proof (n.) must be a poor one if it does not first of all convince the man who presents it.
Proof (n.) that you cannot produce without your notebooks, even in peril of your life, shows what you lack: certitude.
Proof (n.) about God puts a man as it were inside God proving things about him; from the proof nothing follows for me, from faith everything does.
Proof (n.) is what the believer refuses: anything that could prove his expectation could also disprove it.
Proof (n.) is a distinguished traveller everyone admires once we grow older; give a youth the straw from which the thinker would prove God, and he needs no proof, having the straw and God.