"The migratory movement is at once perpetual, partial and universal. It never ceases, it affects every people … at a given moment it sets in motion only a small number of each population … in fact there is never a moment of immobility for any people, because no migration remains isolated."

“War is a mass phenomenon. To penetrate the basic causes of war, we must discern the factors which have made millions of people abandon their habitual modes of life, their occupations, and their moral concepts to participate in murder and destruction. We should therefore put greater stress upon the simple conscious and .subconscious impulses which rule the behavior of the masses.”

“Man's history is the story of his wanderings. Some epochs of the remote past have frequently been called 'periods of great migrations.' This terminology presumes that at other times migratory movements were at a standstill, especially in the case of a so-called 'sedentary' people. Every epoch is a period of "great migrations.”

“Today a host of foreigners unprecedented in number and unparalleled in character is living and working in Germary like a gigantic pump, the new German Reich is sucking in all it resources of Europe and masses of Europe's working population.”

“Ethnic Germans were transferred into Germany, mainly from eastern Europe; it has been estimated that approximately 600,000 persons had been transferred into the German Reich by the spring of 1942.”

“The question of the size of the postwar population of the Soviet Union is not the least of the enigmas which have been baffling students of Russian affairs. Hardly any estimate or evaluation of an economic, sociological or military character for the U.S.S.R. can be made meaningful without an accurate knowledge of the demographic base.”

“The resettlement of populations scattered by war and by enemy occupation is one of the problems with which Europe will be most urgently faced when the occupied countries are set free. Since hostilities began, millions of people have left homes destroyed or threatened with destruction; millions more have been transplanted, deported, or expelled to make room for foreign newcomers who have taken over their property; millions of others again have been taken prisoner or individually recruited as workers and sent away from their countries to serve the occupying power.”