One can resist the invasion of an army but one cannot resist the invasion of ideas.

Sacrificing the earth for paradise is giving up the substance for the shadow.

There is such a thing as the pressure of darkness.

I repeat, whether we be Italians or Frenchmen, misery concerns us all.

One resists the invasion of armies; one does not resist the invasion of ideas.

First problem. To produce wealth. Second problem. To distribute it.

Progress is the life-style of man.