"The preservation of a democratic civilization requires the wisdom of the serpent and the harmlessness of the dove. The children of light must be armed with the wisdom of the children of darkness but remain free from their malice. They must know the power of self-interest in human society without giving it moral justification. They must have this wisdom in order that they may beguile, deflect, harness and restrain self-interest, individual and collective, for the sake of the community."

"It is obvious that man does not have the power to extricate himself from flux and finiteness, as idealists and mystics of the ancient and the modern world believed. It is equally obvious that history does not solve the basic problems of human existence but reveals them on progressively new levels."