It isn't a brute instinct that keeps us restless and dissatisfied. I'll tell you what it is: it's the highest goal of man - the need to grow and advance . . . to find new things . . . to expand. To spread out, reach areas, experiences, comprehend and live in an evolving fashion. To push aside routine and repetition, to break out of mindless monotony and thrust forward. To keep moving on . . .