Edison, the Man (1940)

Mr. Taggart: We've no guarantee that these theories of yours are workable.
Thomas A. Edison: Well, most electricity is theory yet.
Mr. Taggart: That's the trouble. Beyond a point what good is electricity anyway?
Thomas A. Edison: What good is a newborn baby?

Thomas A. Edison: Uncle Ben, I've got to do something, and I'm open for suggestions.
Ben Els: You foolin', Tom?
Thomas A. Edison: I wish I was?
Ben Els: Nobody ever asked me for advice before.
Thomas A. Edison: Why, then, you ought to have a lot of it stored up.

Ben Els: I keep worryin' about Bunt. I guess I won't get a wink of sleep tonight.
Thomas A. Edison: Ah, Mr. Els, you shouldn't try to do two things at once. If you're gonna sleep, sleep. If you're gonna worry, why stay awake and make a good job of it.