History shows us that other highly developed forms of civilization have collapsed. Who knows whether the same fate does not await our own?

Technology is a useful servant but a dangerous master.

But teleological considerations can lead no further than to a belief and a hope. They do not give certainty.

Propaganda must appeal to mankind's better judgment and to the necessary belief in a better future. For this belief, the valley of the shadow of death is but a war station on the road to the blessed summit.

The simultaneous reactions elicited all over the world by the reading of newspaper dispatches about the same events create, as it were, a common mental pulse beat for the whole of civilized mankind.

Just as characteristic, perhaps, is the intellectual interdependence created through the development of the modern media of communication: post, telegraph, telephone, and popular press.

The free trade movement in the middle of the last century represents the first conscious recognition of these new circumstances and of the necessity to adapt to them.