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The Perfection of Yoga
Bhagavad-gītā  is concerned. A whole purification of consciousness is required.
In the execution of  yoga , it is very important that the mind is not agitated.
yathā dīpo nivātastho neṅgate sopamā smṛtā yogino yata-cittasya yuñjato yogam ātmanaḥ
“As a lamp in a windless place does not waver, so the transcendentalist, whose mind is controlled, remains always steady in his meditation on the transcendent Self.” (Bg. 6.19) When a candle is in a windless place, its flame remains straight and does not waver. The mind, like the flame, is susceptible to so many material desires that with the slightest agitation it will move. A little movement of the mind can change the whole consciousness. Therefore in India one seriously practicing  yoga  traditionally remained  brahmacārī , or celibate. There are two kinds of  brahmacārī ; one is completely celibate and and the other is  grhastha-brahmacārī , that is to say he has a wife, he does not associate with any other woman, and his relations with his own wife are strictly regulated. In this way, either by complete celibacy or restricted sex life, one’s mind is kept from being agitated. Yet when one takes a vow to remain a complete celibate, his mind may still be agitated by sexual desire; therefore in India those practicing the traditional  yoga  under strict vows of celibacy are not allowed to sit alone even with a