There can be little doubt that man owes some of his greatest successes in the past to the fact that he has not been able to control social life. His continued advance may well depend on his deliberately refraining from exercising controls which are now in his power.

[T]hose who are willing to surrender their freedom for security have always demanded that if they give up their full freedom it should also be taken from those not prepared to do so.

We know, in other words, the general conditions in which what we call, somewhat misleadingly, an equilibrium will establish itself: but we never know what the particular prices or wages are which would exist if the market were to bring about such an equilibrium.

We shall not grow wiser before we learn that much that we have done was very foolish.

Many who think themselves infinitely superior to the aberrations of Nazism, and sincerely hate all manifestations, work at the same time for ideals whose realization would lead straight to the abhorred tyranny.

The chief point we must remember is that the great and rapid advance of the physical sciences took place in fields where it proved that explanation and prediction could be based on laws which accounted for the observed phenomena as functions of comparatively few variables - either particular facts or relative frequencies of events.

Few are ready to recognize that the rise of fascism and Nazism was not a reaction against the socialist trends of the preceding period but a necessary outcome of those tendencies.