What is the philosophy of esotericism?
Somewhat crudely, esotericism can be described as a Western form of spirituality that stresses the importance of the individual effort to gain spiritual knowledge, or gnosis, whereby man is confronted with the divine aspect of existence.
It is NOT a Science ...it is a practice or philosophy ......GNOSTICISM would be an excellent example
What is Gnostic in simple terms?
The word gnostic comes from the Greek word gnostikos, meaning "knowing" or "able to discern." If the word has a capital "G" — Gnostic — it describes something related to Gnosticism, a form of nonconventional mystical Christianity that emerged in the 2nd century and is still considered heretical by many Christians.