Here is a nice quote I found from Sayers concerning John Dickson Carr:
Mr. Carr can lead us away from the small, artificial world of the ordinary detective plot into the menace of outer darkness. He can create atmosphere with an adjective, and make a picture from a wet iron railing, a dusty table, a gas-lamp blurred by the fog. He can alarm with an illusion or delight with a rollicking absurdity... Every sentence gives a thrill of positive pleasure." -- Dorothy L. Sayers
Any other favorite quotes?