Henry Tizard

"We persist in regarding ourselves as a great power, capable of everything and only temporarily handicapped by economic difficulties. We are not a great power and never will be again. We are a great nation, but if we continue to behave like a great power we shall soon cease to be a great nation."

"The secret of science is to ask the right question, and it is the choice of problem more than anything else that marks the man of genius in the scientific world."