The feeling of loneliness, udasinata, dryness and lack of rasa come very usually when the vital part is disappointed in its desires or tries to give them up but has not yet attained a quiet indifference towards them. It is necessary to replace this condition by the true quietude which will allow the psychic being to become again active and reopen the doors of inner experience, and we shall try to get this done.
Ref: Letters on Yoga Vol. IV