Many a blessed woman, who dies unsung and unremembered, has given out more of the real vital heat that keeps the life in human souls, without a spark flitting through her humble chimney to tell the world about it, than would set a dozen theories smoking, or a hundred odes simmering, in the brains of so many men of genius.
 Oliver Wendell Holmes Sr., The Professor at the Breakfast-Table (1860). copy citation

Context

“Character evolves its best products for home consumption; but, mind you, it takes a deal more to feed a family for thirty years than to make a holiday feast for our neighbors once or twice in our lives. You talk of the fire of genius. Many a blessed woman, who dies unsung and unremembered, has given out more of the real vital heat that keeps the life in human souls, without a spark flitting through her humble chimney to tell the world about it, than would set a dozen theories smoking, or a hundred odes simmering, in the brains of so many men of genius. It is in latent caloric, if I may borrow a philosophical expression, that many of the noblest hearts give out the life that warms them. Cornelia's lips grow white, and her pulse hardly warms her thin fingers,—but she has melted all the ice out of the hearts of those young Gracchi, and her lost heat is in the blood of her youthful heroes.” source