Events tend to recur in cycles...
In all things there is a law of cycles.
By law of periodical repetition, everything which has happened once must happen again and again -- and not capriciously, but at regular periods, and each thing in its own period, not another's and each obeying its own law.
Each thing is of like form from everlasting and comes round again in its cycle.
What has been will be again. What has been done will be done again... [Ecclesiastes 1:9]
All motion is cyclic. It circulates to the limits of its possibilities and then returns to its starting point.
Everything comes if a man will only wait.
That which the fountain sends forth returns again to the fountain.