“The people who lie the most are nearly always the clumsiest at it, and they're easier to fool with lies than most people, too. You'd think they'd be on the look-out for lies, but they seem to be the very ones that will believe almost anything at all.”

“We didn't exactly believe your story.'Then --?''We believed your two hundred dollars.''You mean --' She seemed not to know what he meant.'I mean that you paid us more than if you'd been telling the truth,' he explained blandly, 'and enough more to make it all right.”

“He did not smile. "I don't believe in anything, but I'm too much of a gambler not to be affected by a lot of things.”

“That's wonderful. I do like a man that tells you right out he’s looking out for himself. Don’t we all? I don’t trust a man that says he’s not. And the man that’s telling the truth when he says he’s not I distrust most of all, because he’s and ass and an ass that’s going contrary to the laws of nature.”

“If the Old Man said something was so, then it probably was, because he was one of these cautious babies who'll look out the window at a cloudburst and say, "It seems to be raining," on the off-chance that somebody's pouring water off the roof.”

“Joel Cairo: You always have a very smooth explanation ready.Sam Spade: What do you want me to do, learn to stutter?”

“When he awakened again he could stand, and did. He doused his head in cold water and drank four glasses of water. The water made him sick and after that he began to shake with a chill. He went into the bedroom and lay down on the bare blood-stained mattress, but got up almost immediately to go stumbling and staggering in haste back to the bathroom, where he got down on hands and knees and searched the floor until he had found the rusty razor-blade. He sat on the floor and put the razor-blade into his vest-pocket. Putting it in, his fingers touched his lighter. He took the lighter out and looked at it. A cunning gleam came into his one open eye as he looked at the lighter. The gleam was not sane.”