You should have been a chemist, Henri.
4 seconds sound clip from the Monsieur Verdoux movie soundboard.
You can hear this line at 00:54:18 in the Blu-ray version of the movie.
Quote context
[...]
- I hope we'll be seeing more of you, Henri.
- You never will. He must be on the go every minute.
- Unfortunately, one gets caught up in this monoxide world of speed and confusion.
- You should have been a chemist, Henri.
- Chemistry, my dear fellow, is the material manifestation of the metaphysical.
- Do you remember some time ago discussing a humane method of doing away with dumb animals?
- A lethal formula for veterinary work? No pain. No convulsions. Absolutely tasteless.
- The creature drinks it and in about an hour curls up into a comfortable sleep and dies.
[...]