Diseases are generated in one's body through the following causes, viz., sleeping in daytime, late vigils over night, excess of sexual intercourse, moving in crowd, the checking of the discharge of urine and fæces, the evil of unwholesome food and laborious mental operation with prāṇa. If a yogin is afraid of such diseases (when attacked by them), he says, "my diseases have arisen from my practice of yoga." Then he will discontinue this practice. This is said to be the first obstacle to yoga The second (obstacle) is doubt; the third is carelessness; the fourth, laziness; the fifth, sleep; the sixth, the not leaving of objects (of sense); the seventh, erroneous perception; the eighth, sensual objects; the ninth, want of faith; 1 and the tenth, the failure to attain the truth of yoga. A wise man should abandon these ten obstacles after great deliberation. The practice of prāṇāyāma should be performed daily with the mind firmly fixed on Truth. Then chiṭṭa is absorbed in sushumnā, and prāṇa (therefore) never moves. When the impurities (of chiṭṭa) are thus removed and prāṇa is absorbed in sushumnā, he becomes a (true) yogin. Apāna, which has a downward tendency should be raised up with effort by the contraction (of the anus), and this is spoken of as mūlabanḍhā. Apāna thus raised up mixes with agni and