Note 1222 — AN ESSAY ON MAN, IN FOUR EPISTLES (continued 3)
Reading edition
"Great purposes," says Warburton in explanation of this passage, "are served by vice and virtue invading each other's bounds, no less than the perfecting the constitution of the whole, as lights and shades, in a well wrought picture, make the harmony and spirit of the composition." By this rule virtue dashed with vice is more "spirited and harmonious" than virtue without alloy. Warburton allowed himself to be deluded by a metaphor. Black paint has no resemblance to black morals,—shadows in a picture to hatred, avarice, and so on.