Religion is what a person does in his solitariness.

When success turns a man's head he faces failure

The art of progress is to preserve order amid change and to preserve change amid order.

A philosopher of imposing stature doesn't think in a vacuum. Even his most abstract ideas are, to some extent, conditioned by what is or is not known in the time when he lives.

The whole of mathematics consists in the organization of a series of aids to the imagination in the process of reasoning.

War can protect; it cannot create.

We must not expect simple answers to far-reaching questions. However far our gaze penetrates, there are always heights beyond which block our vision.