Sydney Greenstreet (Kasper Gutman) from The Maltese Falcon said it! :-P
Damn, I should've called in! Here's the dialogue in question:
Kasper Gutman: You're a close-mouthed man?
Sam Spade: Nah, I like to talk.
Kasper Gutman: Better and better. I distrust a close-mouthed man. He generally picks the wrong time to talk and says the wrong things. Talking's something you can't do judiciously, unless you keep in practice.
[sits back]
Kasper Gutman: Now, sir. We'll talk, if you like. I'll tell you right out, I am a man who likes talking to a man who likes to talk.
Sam Spade: Swell. Will we talk about the black bird?