If Leonardo's example of diversification had been more widely followed, the whole tempo of mechanical and scientific development would have been slowed down. This means that the pace of change might have been established in relation to human need, and that valuable parts of man's cultural heritage might have been kept alive, instead of being ruthlessly extirpated in order to widen the empire of the machine. Instead of rapid advances, on the basis of uncoordinated knowledge, in specialized departments, mainly those concerned with war and economic exploitation, there would have been the possibility of a slower but better-coordinated advance that did justice to the processes, functions, and purposes of life.

For its effective salvation mankind will need to undergo something like a spontaneous religious conversion: one that will replace the mechanical world picture with an organic world picture, and give to the human personality, as the highest known manifestation of life, the precedence it now gives to its machines and computers. This order of change is as hard for most people to conceive as was the change from the classic power complex of Imperial Rome to that of Christianity, or, later, from supernatural medieval Christianity to the machine-modeled ideology of the seventeenth century. But such changes have repeatedly occurred all through history; and under catastrophic pressure they may occur again. Of only one thing we may be confident. If mankind is to escape its programmed self-extinction the God who saves us will not descend from the machine: he will rise up again in the human soul.

Now, the desire for money, Thomas Aquinas pointed out, knows no limits, whereas all natural wealth, represented in the concrete form of food, clothing, furniture, houses, gardens, fields, has definite limits of production and consumption, fixed by the nature of the commodity and the organic needs and capacities of the user. The idea that there should be no limits upon any human function is absurd: all life exists within very narrow limits of temperature, air, water, food; and the notion that money alone, or power to command the services of other men, should be free of such definite limits is an aberration of the mind.