War can protect; it cannot create.

From the moment of birth we are immersed in action, and can only fitfully guide it by taking thought.

The only use of knowledge of the past is to equip us for the present.

I regret that it has been necessary for me in this lecture to administer a large dose of four-dimensional geometry. I do not apologize, because I am really not responsible for the fact that nature in its most fundamental aspect is four-dimensional. Things are what they are.

In a sense, knowledge shrinks as wisdom grows, for details are swallowed up in principles. The details for knowledge which are important, will be picked up ad hoc in each avocation of life, but the habit of the active utilization of well-understood principles is the final possession of WISDOM.

Governments are best classified by considering who are the 'somebodies' they are in fact endeavouring to satisfy.

Civilization advances by extending the number of important operations which we can perform without thinking of them.