... the fouling of the nest which has been typical of man's activity in the past on a local scale now seems to be extending to the whole world society.

Economics, we learn in the history of thought, only became a science by escaping from the casuistry and moralizing of medieval thought.

Canada has no cultural unity, no linguistic unity, no religious unity, no economic unity, no geographic unity. All it has is unity.

Conventions of generality and mathematical elegance may be just as much barriers to the attainment and diffusion of knowledge as may contentment with particularity and literary vagueness... It may well be that the slovenly and literary borderland between economics and sociology will be the most fruitful building ground during the years to come and that mathematical economics will remain too flawless in its perfection to be very fruitful.

The World is a very complex system. It is easy to have too simple a view of it, and it is easy to do harm and to make things worse under the impulse to do good and make things better.

All knowledge is gained through an orderly loss of information.

[The historical] development in the international system may almost be defined as the process by which we pass from stable war to stable peace.