The combination of these two — the inner urge, the drive, and a fit and appropriate environment or field— means the evolving, the coming out into man… - Gottfried de Purucker

Concerning the nature of the cyclical times when the great teachers either appear personally in the world of men or send a messenger, it may be stated that the greatest teachers come at the opening or close of the longest cyclical periods; the messengers or envoys are sent forth at the opening or closing of the short cycles, and the teachers or messengers of intermediate power come at the beginnings or endings of time-periods of intermediate length. (Chapter 22)

They were not so created by any extra-cosmic Deity, but they are men who have become what they are by means of inward spiritual striving, by spiritual and intellectual yearning, by aspiration to be greater and better, nobler and higher. They are not what they are by any favoritism either of a god or of Fate, but have merely run ahead of the great multitude of men. There they stand; they are Helpers, they are Seers, they are Sages.

These two teachings once held secret, or openly promulgated in a more or less imperfect form, are examples of the manner in which from age to age when the need arises for so doing, esoteric teachings are openly developed by the Brotherhood of sages and seers. Such teachings profoundly modify civilization because they profoundly change human psychology and the spiritual and intellectual vision of mankind. (Chapter 2)