The following quotes of Sri Aurobindo are from the "Divine Plan" website (no longer online)
"It [The Subconscient] is the Inconscient in the process of becoming conscious. It is a support and a even a root of our inferior parts of beings and their movements. It sustains and reinforces all in us that clings most and refuses to change, our mechanical recurrences of unintelligent thought, our persistent obstinacies of feeling, sensation, impulse, propensity, our uncontrolled fixities of character. The mind in us, - the infernal also - has its lair of retreat in the dense jungle of the subconscious. A decent into the subconscient would not help us to explore this region, for it would plunge us into incoherence, or into sleep, or a dull trance or a comatose torpor. A mental scrutiny or insight can give us some indirect and constructive idea of these hidden activities; but it is only by drawing back into the subliminal or by ascending into the superconscient and from there looking down or extending ourselves into these obscure depths that we can become directly and totally aware and in control of the secrets of our subconscient physical, vital and mental nature."
Man harbours dangerous forces in his house.
The Titan and the Fury and the Djinn
Lie bound in the subconscient's cavern pit
And the Beast grovels in his antre den.
The following summary is from Growth Online [ref Theory of Creation - Involution and Evolution]: