It's not lawful for us to take upon ourselves those acts which are not in man's normal power to effect.
9 seconds sound clip from the The Man Who Could Work Miracles (1954) movie soundboard.
You can hear this line at 00:18:44 in the DVD version of the movie.
Quote context
[...]
- He was a regular chapel-goer, and the following Sunday evening found him in chapel as usual.
- What shall it profit a man if he gain the whole world and lose his own soul?
- Therefore I say unto you, my brethren...
- It was in Mr. Maydig's study that he finally unburdened himself.
- I can only say that I didn't make such a pact with anybody.
[...]