There is a fundamental principle in philosophy to the effect that the world of thought revolves in cycles, a principle which all schools of thought allow. So deep-rooted in the very entrails of the history of the world are the repercussions of this principle that it has been laid down as a fixed law in philosophy that every worthwhile system of thought passes through three stages in its development and decline. There exists a succession of philosophical cycles in the history of thought: first there is a gradual progress towards an ideal; next, that ideal becomes a system of philosophy; then there is a period of decay and of retrogression. It is especially to he noted that new problems arise in each one of these three cycles. It is likewise ...