…to quiet the mind and get the spiritual experience it is necessary first to purify and prepare the nature. This sometimes takes many years.Work done with the right attitude is the easiest means for that—i.e. work done without desire or ego, rejecting all movements of desire, demand or ego when they come, done as an offering to the Divine Mother, with the remembrance of her and prayer to her to manifest her force and take up the action so that there too and not only in inner silence you can feel her presence and working.
Ref: Letters on Yoga – II