The second line that Harry Silver quotes to Louis 'King' Koster is from François Villon's "Testament," "When death, that cheater of cheats comes knocking, and his voice grows near, where are the snows of yesteryear?"
The line that Harry Silver quotes to Marian Koster as overheard by Cutter is from Percy Bysshe Shelley's "Love's Philosophy." "The fountains mingle with the river, and the rivers with the ocean."
The first line that Harry Silver quotes to Louis 'King' Koster is from Lord Byron's "She Walks In Beauty," "She walks in beauty, like the night. Of cloudless climes and starry skies."