what is it?

From Emerson's "Love""...a fire that kindling its first embers in the narrow nook of a private bosom, caught from a wandering spark out of another private heart, glows and enlarges until it warms and beams upon multitudes of men and women , upon the universal heart of all, and so lights up the whole world and all nature with its generous flames.""...power to his heart and brain, which created all