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The doctrine of Cycles is one of the most important in the whole theosophical system, though the least known and the most infrequently referred to. Western investigators have for some centuries suspected that events move in cycles, and a few of the writers in the field of European literature have dealt with the subject, but all in a very incomplete fashion. This incompleteness and want of accurate knowledge have been due to the lack of belief in spiritual things and the desire to square everything with materialistic science. Knowledge of cyclic law is not given out in detail by the Masters of Wisdom. But enough has been divulged, and enough was for a long time known to the Ancients to add considerably to our knowledge.
The Ocean of Theosophy, Chapter 14 (Online):