No being can be what he is unless he is putting his essence into action in his field.

Our western science is a child of moral virtues; and it must now become the father of further moral virtues if its extraordinary material triumphs in our time are not to bring human history to an abrupt, unpleasant and discreditable end.

The twentieth century will be chiefly remembered by future generations not as an era of political conflicts or technical inventions, but as an age in which human society dared to think of the welfare of the whole human race as a practical objective.

The human race's prospects of survival were considerably better when we were defenceless against tigers than they are today when we have become defenceless against ourselves.

Immaturity means self-centeredness, inability to compromise, to rise above hurt feelings, to postpone immediate pleasures in favor of future benefits, or to do unpleasant chores when they need to be done.

The course of human history consists of a series of encounters between individual human beings and God in which each man and woman or child, in turn, is challenged by God to make his free choice between doing God's will and refusing to do it.

No being can be what he is unless he is putting his essence into action in his field.