देव्युवाच ।। कथं जेजीय्यते कालो योगिभिर्योगवित्प्रभो ।। ध्यानेन चाथ मन्त्रेण तत्सर्वं कथयस्व मे ।। २१।।
The goddess said:— O lord of the knowers of Yoga, how is Kāla wished to be conquered by the Yogins? Is it by meditation or incantations? Please mention everything to me.
O fair lady, it is to be imparted to the faithful, to the intelligent, to one who is endowed with devotion, to the pious who is not an atheist and to oie who is always virtuous.
The knower of Yoga shall practise it taking breath normally sitting on a good bed. If he practises in darkness he shall not keep any lamp. He shall practise when people are asleep.