But it was very dangerous, and I could only undergo each experiment after a long period of rest.

6 seconds sound clip from the Fiend Without a Face (1958) movie soundboard.

You can hear this line at 00:55:29.871 in the Blu-ray version of the movie.

Quote context

[...]

- He introduced me to Barbara Griselle.

- With Barbara as my secretary, I was able to satisfy my publisher and continue my experiments to materialize thought.

- For a long time, I persisted in this one experiment without success... until one night.

- The lightning, in striking the house, gave my instruments a sudden violent charge of power. And my thought was free, free to turn the page of a book.

- I altered the design of my equipment to generate these violent power boosts.

- But it was very dangerous, and I could only undergo each experiment after a long period of rest.

- Whenever I felt well enough to absorb the shock, I found no difficulty in moving small objects.

- Eventually, I developed a certain tolerance to the high voltages I used.

- But what I really needed for regular experiments was a new form of power, something that was smoother, something that would flow through my brain without causing collapse. The new atomic plant at the air base provided me with this power.

- I devised additional apparatus that enabled me to divert a portion of the atomic power that was radiating between the ground station and the radar aircraft circling 40000 feet above.

[...]