Famous quotes containing the words maintain and/or stability:
“He should be as vigorous as a sugar maple, with sap enough to maintain his own verdure,... and not like a vine, which being cut in the spring bears no fruit, but bleeds to death in the endeavor to heal its wounds.”
—Henry David Thoreau (1817–1862)
“Two things in America are astonishing: the changeableness of most human behavior and the strange stability of certain principles. Men are constantly on the move, but the spirit of humanity seems almost unmoved.”
—Alexis de Tocqueville (1805–1859)