In the path of sadhana [practices] no effort is in vain; all sincere
efforts bear their fruits in the unconscious mind according to the
inevitable law of karma. Impressions live in the unconscious, in the
storehouse of one's memory. Even a little sadhana practiced with
sincere effort leaves deep imprints in the unconscious mind. Those
impressions help and guide the sadhaka whenever he goes off the path.
The conscious part of thie mind is but a small part of the whole. It
is helpful in communicating with the external world but has very
little use on the inward journey. If the conscious part of the mind is
trained not to create further barriers, then sadhana is useful.
Perennial Psychology of the Bhagavad Gita