Everything has a physical part — even the mind has a physical part; there is a mental physical, a mind of the body and the material... One can only distinguish that when the consciousness becomes sufficiently subtle to do so.
The mind in the physical or mental physical is limited by the physical view and experience of things, it mentalises the experiences brought by the contacts of outward life and things, and does not go beyond that (though it can do that much very cleverly).
Mental physical or body-mind which when left to itself simply goes on repeating
the past customary thoughts and movements or at the most adds to them such further mechanical reactions to things
and reflexes as are in the round of life.
Repetition is the habit of the mental physical — it is not the true thinking mind that does like that, it is the mental physical or else the lowest part of the physical mind.
All developed mental men, those who get beyond the average, have in one way or other or at least at certain times and for certain purposes to separate the two parts of the mind, the active part which is a factory of thoughts and the quiet masterful part which is at once a Witness and a Will, observing them, judging, rejecting, eliminating, accepting, ordering corrections and changes, the Master in the House of Mind, capable of self-empire, sãmrãjya.
The yogi goes still further; he is not only a master there, but even while in mind in a way, he gets out of it as it were, and stands above or quite back from it and free. For him the image of the factory of thoughts is no longer quite valid; for he sees that thoughts come from outside...
Advancing tardily from a limping start,
Crutching hypothesis upon argument,
Throning its theories as certitudes,
It reasons from the half-known to the unknown.