While the nominal strength of a country is represented by its numbers and resources, this muscular development is dependent on the state of its internal organs and nerve-system - upon its stability of control, morale, and supply.

Inflict the least possible permanent injury, for the enemy of to-day is the customer of the morrow and the ally of the future

The most effective indirect approach is one that lures or startles the opponent into a false move - so that, as in ju-jitsu, his own effort is turned into the lever of his overthrow.

A complacent satisfaction with present knowledge is the chief bar to the pursuit of knowledge.

Air forces offered the possibility of striking a the enemy's economic and moral centres without having first to achieve 'the destruction of the enemy's main forces on the battlefield'. Air-power might attain a direct end by indirect means - hopping over opposition instead of overthrowing it.

If you want peace, understand war.

The practical value of history is to throw the film of the past through the material projector of the present on to the screen of the future.