Don Juan monologue (Act 3) — Man and Superman

That is why intellect is so unpopular. But to Life, the force behind the Man, intellect is a necessity, because without it he blunders into death. Just as Life, after ages of struggle, evolved that wonderful bodily organ the eye, so that the living organism could see where it was going and what was coming to help or threaten it, and thus avoid a thousand dangers that formerly slew it, so it is evolving to-day a mind's eye that shall see, not the physical world, but the purpose of Life, and thereby enable the individual to work for that purpose instead of thwarting and baffling it by setting up shortsighted personal aims as at present. Even as it is, only one sort of man has ever been happy, has ever been universally respected among all the conflicts of interests and illusions.