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.
The frontiers of knowledge in the various fields of our subject are expanding at such a rate that work as hard as one can one finds oneself further and further away from an understanding of the whole.
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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.
