Perseverance must have some practical end, or it does not avail the man possessing it. A person without a practical end in view becomes a crank or an idiot. Such persons fill our asylums.

I begin my work at about nine or ten o'clock in the evening and continue until four or five in the morning. Night is a more quiet time to work. It aids thought.

I am a believer in unconscious cerebration. The brain is working all the time, though we do not know it. At night it follows up what we think in the daytime. W…

Neither the Army nor the Navy is of any protection, or very little protection, against aerial raids.

A big part of willpower is having something to aspire to, something to live for.

Ad astra per aspera.

Many people flounder about in life because they have no purpose. Before it is possible to achieve anything, an objective must be set.