To me this appears the most satisfactory interpretation of the present state of Life on the surface of the earth; despite a regrettable recrudescence of racialism and
nationalism which, impressive though it may be, and disastrous in its effect upon our private post-war lives, seems to have no scientific importance in the overall process: for the reason that any human tendency to fragmentation, regardless of its extent and origin, is clearly of an order of magnitude inferior to the planetary forces (geographic, demographic,
economic and psychic) whose constantly and naturally
growing pressure must sooner or later compel us willy - nilly to unite in some form of human whole organized on the basis of human solidarity.