Thrust into my profession without any training whatsoever, I had to just flounder and just find my way. It was an agonizing experience. It’s like jumping off a diving board in the Olympic contest without knowing how to swim or dive, and I just had to find my way. So one day, I said to Jimmy Cagney, “Jimmy, what is acting?” and he said, “I don’t know.” He said, “All I can tell you is whatever you say, mean it,” and I thought that marvelous counsel.
Recorded Academy of Achievement interview, Washington, D.C., 5 October 2006 source ↗