Lambert, then, Will and Thought were _living forces_; and he spoke of them in such a way as to impress his belief on the hearer. To him these two forces were, in a way, visible, tangible. Thought was slow or alert, heavy or nimble, light or dark; he ascribed to it all the attributes of an active agent, and thought of it as rising, resting, waking, expanding, growing old, shrinking, becoming atrophied, or resuscitating; he described its life, and specified all its actions by the strangest words in our language, speaking of its spontaneity, its strength, and all its qualities with a kind of intuition which enabled him to recognize all the manifestations of its substantial existence. "Often," said he, "in the midst of quiet and silence, when our inner faculties are dormant, when a sort of darkness reigns within us, and we are lost in the contemplation of things outside us, an idea suddenly flies forth, and rushes with the swiftness of lightning across the infinite space which our inner vision allows us to perceive. This radiant idea, springing into existence like a will-o'-the-wisp, dies out never to return; an ephemeral life, like that of babes who give their parents such infinite joy and sorrow; a sort of still-born blossom in the fields of the mind. Sometimes an idea, instead of springing forcibly into life and dying unembodied, dawns gradually, hovers in the unknown limbo of the organs where it has its birth; exhausts us by long gestation, develops, is itself fruitful, grows outwardly in all the grace of youth and the promising attributes of a long life; it can endure the closest inspection, invites it, and never tires the sight; the investigation it undergoes commands the admiration we give to works slowly elaborated. Sometimes ideas are evolved in a swarm; one brings another; they come linked together; they vie with each other; they fly in clouds, wild and headlong. Again, they rise up pallid and misty, and perish for want of strength or of nutrition; the vital force is lacking. Or again, on certain days, they rush down into the depths to light up that immense obscurity; they terrify us and leave the soul dejected. "Ideas are a complete system within us, resembling a natural kingdom, a sort of flora, of which the iconography will one day be outlined by some man who will perhaps be accounted a madman. "Yes, within us and without, everything testifies to the livingness of those exquisite creations, which I compare with flowers in obedience to some unutterable revelation of their true nature! "Their being produced as the final cause of man is, after all, not more amazing than the production of perfume and color in a plant. Perfumes _are_ ideas, perhaps! "When we consider the line where flesh ends and the nail begins contains the invisible and inexplicable mystery of the constant transformation of a fluid into horn, we must confess that nothing is impossible in the marvelous modifications of human tissue.