16: In the Secret Doctrine we are told that there are seven branches of knowledge mentioned in the Puranas.  S. D., I, 192.
Correspondences can here be worked out in connection with:—
a. The seven Rays, the Lords of Sacrifice, Love and Knowledge.
b. The seven states of consciousness.
c. The seven states of matter or planes.
d. The seven types of forces.
e. The seven Initiations and many other septenates.
The Gnosis, the hidden knowledge, is the seventh Principle, the six schools of Indian philosophy are the six principles.—S. D., I, 299.
These six schools are:—
a. The school of Logic..Proof of right perception.
b. The atomic school...System of particulars.  Elements.  Alchemy and chemistry.
c. The Sankhya school...System of numbers.  The materialistic school.  The theory of the seven states of matter or prakriti.
d. The school of Yoga...Union.  The rule of daily life.  Mysticism.
e. The school of Ceremonial religion...Ritual.  Worship of the devas or Gods.
f. The Vedanta school...Has to do with non-duality.  Deals with the relation of Atma in man to the Logos.
The Gnosis or hidden knowledge is the same as Atma vidya, or Theosophy, and includes the other six.