"Like the lure of the Siren's song, Never what it seems to be, yet who among us can resist." ___________________________________
Jerry said this in the syndicated episode (Wednesday, July 10th - "The Jacket"). It was in reference to Kramer's offer of "a lift." Scene: Jerry and George were sitting in restaurant with Altan Benis waiting for Elaine. George replies: "Where do you come up with this stuff?"
My guess is Yeats. Hope some lit scholar can help!
Thanks, Ralph