"The most important rules governing people are those related to action. When will they act, how will they act, and what will be the limits of this action? The answer to these questions is the whole art of politics."

The famous sociologist-psychologist innovates once again, writing a book on Political Psychology.

The great leaders of nations were necessarily great psychologists. Napoleon may have known the psychology of the French very well, but he deeply ignored that of the Russians and the Poles, and his ignorance led him to the adventure of wars, where his conquering genius failed in the face of unsuspecting patriotism, which no force could overcome.
The science of governing is as necessary as political leaders will not be able to surpass it. It is built with various materials derived from the study of individual psychology and that of the crowd, the psychology of nations, and finally from the lessons of History.