The Gospel of St. Luke: 20:21 et seq. – And they asked him, saying … "Is it lawful for us to give tribute unto Caesar, or no?" But he perceived their craftiness, and said unto them, "Shew me a penny, Whose image and superscription hath it?" They answered and said, "It is Lincoln's."
And he said unto them, "Never mind that, but render unto Caesar the things which be Caesar's, and keep rendering until I say enough; and render unto God the things which be God's through federally funded, faith-based social programs."
Cute, huh? More here.