knowledge of human life. So travel and live for yourself."
"Leave me to my homely four walls," answered the philosopher. "The world of appearances is well enough investigated and described by others for us to follow its laws by quiet observation. I am ever myself in my cell here, and strive to collect around me all the spirits of truth. Believe me, it is a numerous and goodly company, and I am never alone or desolate; and if I am alone with myself, I can investigate more quietly and uninterruptedly the mingled elements and connecting links of the human mind. He who from the height of a bird's flight can take in with his eye how one stream flows into another, and at last all flow into the sea, can see no more than is offered to the quiet glance when it follows the inner cross currents of the mind. Yes, he who can live quietly alone with his own mind—with a mind that is controlled or influenced by nothing foreign to itself—he lives again in Paradise, happy in himself and in the universe."
Oldenburg's eyes had never yet sparkled as they did now; there was a thrill of reverence and ecstasy perceptible in his usually firm voice and in his whole deportment as he rose and said:
"O friend! what can we say to you who have all things in yourself? And yet perhaps a call from without may yet be a motive to you. See, it is not for naught that the legends of all people say that
