If the genius of invention were to reveal to-morrow the secret of immortality, of eternal beauty and youth, for which all humanity is aching, the same inexorable agents which prevent a mass from changing suddenly its velocity would likewise resist the force of the new knowledge until time gradually modifies human thought.
Shall we keep our hands in our bosom, or stretch ourselves on our beds of laziness, while all the world about us is hard at work, in pursuing the designs of its creation?