Blood, force, myth, race, nation; these are to-day the prevailing catchwords; these concepts, we are told, must guide us in developing the new social and political systems. States have been established whose leading principle is not the pursuit of a rational aim, and whose laws are not in conformity with the outlook of rational humanity and democracy. They proclaim their faith in the irrational powers of feeling, in impulses which, until recently, were unanimously looked upon as prejudices, as fallacies which had neither been proved nor were capable of proof.