Yoga Sutra 2.51 the fourth pranayama

Sūtra II.51 The fourth prāṇāyāma comes when both external and internal fields have been felt into The field of the external operation, as measured in terms of place, time, and number, has been practised and felt into. (The second prāṇāyāma) was practice in feeling into the field of the internal operation, as measured similarly. In both practices, the breath became long and fine. The fourth prāṇāyāma comes after the stages (mild, medium and intense) of these two practices have been gradually mastered, and it consists of cessation of both the operations. Whereas the third prāṇāyāma was stopping the breath without having previously brought to awareness the fields (of external and internal objects), the breath becoming long and fine simply by this practice according to place, time, and number; but the cessation in the fourth one comes only after having already brought to awareness those fields, feeling into them by gradually …

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