We measure the earth, sun, stars, and ocean depths. We burrow into the depths of the earth for gold. We search for rivers and mountains on the moon. We discover new stars and know their magnitudes. We sound the depths of gorges and build clever machines. Each day brings a new invention. What don't we think of! What can't we do! But there is something else, the most important thing of all, that we are missing. We do not know exactly what it is. We are like a small child who knows he does not feel well but cannot explain why. We are uneasy, because we know a lot of superfluous facts; but we do not know what is really important-ourselves.