I refuse to prove that I exist, says God, for proof denies faith, and without faith I am nothing.

6 seconds sound clip from The Hitchhiker's Guide to the Galaxy (1981) - Episode 1 sitcom.

You can hear this line at 00:29:11.120 in the Blu-ray version of the TV Series.

Quote context

[...]

- It feeds on brainwave energy, absorbing all unconscious frequencies and then excreting telepathically a matrix formed from the conscious frequencies and nerve signals picked up from the speech centers of the brain.

- The practical upshot of which is that if you stick one in your ear, you instantly understand anything said to you in any form of language.

- The speech you hear decodes the brainwave matrix.

- Now, it is such a bizarrely improbable coincidence that anything so mind-bogglingly useful could evolve purely by chance, that many thinkers have chosen to see it as a final and clinching proof of the non-existence of God.

- The argument runs 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 proves you exist, and so therefore you don't. Q.E.D.

- 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 he goes on to prove that black is white, and gets killed on the next zebra crossing.

- Most leading theologians claim that this argument is a load of dingo's kidneys.

[...]