"There is only one time when it is essential to awaken. That time is now."
Knowledge of the Higher Worlds and its Attainment
- by RUDOLF STEINER 1944
Kundalini, The Mother of the Universe
, by Rishi Singh Gherwal, 
by P.D. Ouspensky  The Fourth Dimension as a key to spiritual existence.
The Anatomy of Melancholy
- By Democritus Junior [Robert Burton] 1621
The Chakras: A Monograph
By C. W. Leadbeater (1927)