Link:—In the next two verses, there is the description of the regulations, that a Yogi has to observe, in his earthly life.
natyasnatastu yogo'sti na caikantamanasnatah na
cati svapnasilasya jagrato naiva carjuna
Yoga is not successful for him who eats too much, nor for one, who does not eat at all; or for him who sleeps too much, nor
too little. 16
Natyasnatastu yogo'sti:—Yoga is not possible, for him who eats too much. Too much eating, causes thirst for water. So he has to drink much water. Too much water, makes the stomach heavy and the body too. If he overeats, he becomes dull and lazy, and may suffer from indigestion, which causes disease in the body. So he cannot concentrate his mind, in adoration and spiritual practice etc. So how can Yoga be possible for him?
Na caikantamana§natah:—Yoga, is also not possible, for him who eats too little. If he is underfed, he will feel hungry, think of food again and again, and become weak. His body, will languish and life will become hard to live. He will be inclined to keep lying down. It will be hard, to sit for meditation. Thus he cannot concentrate his mind, on God. So how is Yoga possible for him?
Na cati svapnasilasya:—Oversleep, makes a striver idle, lazy and inert. In oversleep, the striver cannot sleep soundly, and so different thoughts come to the mind. Thus, oversleep is a hindrance to the practice of meditation.
Jagrato naive carjuna:—This Yoga is not possible for him, who sleeps too little. By keeping aware he feels drowsy, and cannot practise meditation.
Men, of sattvika disposition, while having spiritual discussions, narrating and listening to lives of saints, devotees and incarnations of God, have so much joy and get so much engrossed in them, that they do not feel drowsy, at all even by remaining awake, throughout a night. This wakefulness helps them reach a state, which transcends the three modes of Nature (prakrti).
Similarly, devotees in adoration, loud chanting and constant remembrance of God, are so much engrossed, that they do not feel hungry. This cannot be said as 'not eating' (amsua:) because all doings by men while devoted to God, become 'Sat'.