A knowledge of the forces that rule society, of the causes that have produced its upheavals, and of society's resources for promoting healthy progress has become of vital concern to our civilization.

Ancient metaphysics underwent many changes at the hands of medieval thinkers who brought it in line with the dominant religious and theological movements of their day.

In the real life-process, willing, feeling, and thinking are only different aspects.

The sciences which take socio-historical reality as their subject matter are seeking, more intensively than ever before, their systematic relations to one another and to their foundation.

Any theory intended to describe and analyze socio-historical reality cannot restrict itself to the human spirit and disregard the totality of human nature.

The knife of historical relativism... which has cut to pieces all metaphysics and religion must also bring about healing.

The existence of inherent limits of experience in no way settles the question about the subordination of facts of the human world to our knowledge of matter.