Observant of the excellent ordinances about Yoga, sitting in summer in the midst of four fires on four sides with the sun overhead, duly practising what is called Manduka-Yoga, and always seated in the attitude called Virasana, and lying on naked rocks or the earth, these men, with hearts fixed upon virtue, must expose themselves to cold and water and fire.
युक्तैर्योगवहैः सद्भिीष्मे पञ्चतपैस्तथा। मण्डूकयोगनियतैर्यथान्यायं निषेविभिः॥ वीरासनरतैर्नित्यं स्थण्डिले शयनं तथा। शीततोयाग्नियोगश्च चर्तव्यो धर्मबुद्धिभिः॥