"It has now become a sinister commonplace in the life of the post-war generation that man has never had any hesitation in applying his increasing mechanical power to the destruction of his own kind. The World War has now demonstrated the appalling possibilities of man's mechanical power of destruction. The only force that can successfully oppose it is the human conscience – something which the younger generation is accustomed to regard as a fixed group of outworn scruples. Everyone knows that man's amazing mechanical power is the product of a long evolution, but it is not commonly realized that this is also true of the social force which we call conscience – although with this important difference: as the oldest known implement-making creature man has been fashioning destructive weapons for possibly a million years, whereas conscience emerged as a social force less than five thousand years ago. One development has far outrun the other; because one is old, while the other has hardly begun and still has infinite possibilities before it. May we not consciously set our hands to the task of further developing this new-born conscience until it becomes a manifestation of good will, strong enough to throttle the surviving savage in us? That task should surely be far less difficult than the one our savage ancestors actually achieved: the creation of a conscience in a world where, in the beginning, none existed."