Air power may either end war or end civilization.

Danger gathers upon our path. We cannot afford - we have no right - to look back. We must look forward

If Europe were once united in the sharing of its common inheritance there would be no limit to the happiness, the prosperity, and the glory which its three or four million people would enjoy.

I do not understand this squeamishness about the use of gas... I am strongly in favour of using poisoned gas against uncivilised tribes... It is not necessary to use only the most deadly gases: gases can be used which cause great inconvenience and would spread a lively terror and yet would leave no serious permanent effects on most of those affected.

It always looks so easy to solve problems by taking the line of least resistance.

Nothing is won without enthusiasm.

It is not given to princes, statesmen and captains to pierce the mysteries of the future, and even the most penetrating gaze reaches only conclusions which, however seemingly vindicated at a given moment, are inexorably effaced by time.