Sleep, tossing of mind, attachment to objects, subtle desires and cravings, laziness, lack of Brahmacharya, gluttony are all obstacles in meditation. Reduce your wants. Cultivate dispassion. You will have progress in Yoga. Vairagya thins out the mind. Do not mix much. Do not talk much. Do not walk much. Do not eat much. Do not sleep much. Do not exert much. Never wrestle with the mind during meditation. Do not use any violent efforts at concentration. If evil thoughts enter your mind, do not use your will force in driving them. You will tax your will. You will lose your energy. You will fatigue yourself. The greater the efforts you make, the more the evil thoughts will return with redoubled force. Be indifferent. Become a witness of those thoughts. Substitute divine thoughts. They will pass away. Never miss a day in meditation. Regularity is of paramount importance. When the mind is tired, do not concentrate. Do not take heavy food at night.