Man strives to provide himself with food, clothing, and housing for the sake of the body; he must also provide himself with some things to keep the mind healthy and happy. It is the mind that conditions even the body. The mind is the instrument, the flywheel, the thickest comrade of man. Through it, one can either ruin oneself or save oneself. Regulated and controlled, channelised properly, it can liberate; wayward and let loose, it can entangle and bind fast. Try to find out when exactly man is having full and undisturbed peace. You will see that he is at peace only during sushupti (deep sleep). For, at that time, the senses are inactive, the mind is inert and unattached to the senses or their targets. So, when senses are made ineffective to drag the mind out, man can attain peace. That is the real sadhana, the basic sadhana: the withdrawal of the senses from the objective world (nivrittimarga). Train the mind to dwell on the inner equipment rather than the outer attractions.