“If there are no self-evident first principles, as a foundation for reasoning to conclusions that are not immediately apparent, how can you construct any kind of a philosophy? If you have to prove even the basic axioms of your metaphysics, you will never have a metaphysics, because you will never have any strict proof of anything, for your first proof will involve you in an infinite regress, proving that you are proving what you are proving and so on, into the exterior darkness where there is wailing and gnashing of teeth. If Descartes thought it was necessary to prove his own existence by the fact that he was thinking, and that his though therefore existed in some subject, how did he prove that he was thinking in the first place? But as to the second step, that God must exist because Descartes had a clear idea of him – that never convinced me, then or at any other time, or now either. There are much better proofs for the existence of God than that one.”

“Have you ever felt love?Did you need scientific proof of this? How would you have definitively and scientifically proved your love existed? If you could not prove it, would that mean your love didn't exist? What would you trust: your own feelings, or science?”

“Now it is such a bizarrely improbable coincidence that anything so mind-bogglingly useful could have evolved purely by chance that some thinkers have chosen to see it as the final and clinching proof of the non-existence of God.The argument goes something like this: "I refuse to prove that I exist,'" says God, "for proof denies faith, and without faith I am nothing.""But," says Man, "The Babel fish is a dead giveaway, isn't it? It could not have evolved by chance. It proves you exist, and so therefore, by your own arguments, you don't. QED.""Oh dear," says God, "I hadn't thought of that," and promptly vanishes in a puff of logic."Oh, that was easy," says Man, and for an encore goes on to prove that black is white and gets himself killed on the next zebra crossing.”

“That's funny because if anyone actually did prove the existence of God we'd just tell him 'nice proof, Fraa Bly' and start believing in God.”

“You can't prove that something doesn't exist. You can only prove that something does exist.”

“But now how can an Apostle prove that he has authority? If he could prove it physically, then he would not be an Apostle. He has no other proof than his own statement. That has to be so; for otherwise the believer's relationship to him would be direct instead of being paradoxical.”