There is a detailed description of pranayam, prana, apana, uddana, samana and vyana. A yogi practises the inhalation and exhalation of the breathing technology. It is completely scientific yet the correct practice can lead to samadhi. One must find the perfect guru to learn the pranayam exercise.

There are different ways of doing sadhna and meditation. Some people do fire offerings by offering havan and ghee. Some do charity. Some follow Rishi patanjali's way of raja yog. But ultimately the sadhak who controls his mind and senses and surrenders his duty to God is said to have done the highest yjna and purification.

A yogi practises the ashtanga yoga method of Rishi Patanjali to control the senses. There is an elaborate explanation of the eight path of patanjali yoga sutra.

There are five kind of fire offerings. They are Bhut yajna, Manusya yajna, Pitru yajna, Dev yajna and brahma yajna. The last two are mostly prtactised in monks and sanyasis.

A saint is pure, enlightened and bright like light. Every work he does is offered to God. The food he eats, his sleep , his duty almost everything is offered to the Almighty. It is offered to the Brahma.

One who controls mind and intellect both, makes himself detached from materialistic desire and only does the duty without expecting the result is actually free and liberated. he or she is not affected. But he has to take care of the body because body is the medium.

Sri Krishna says one who burns his desire and tendencies in the fire of wisdom and knowledge is truly a yogi. Such a yogi is free and liberated. He never allows his mind to dominate and control him rather he makes the mind his own servant. It means mind can not disturb and distract him. Knowledge is like fire.

A true yogi controls and ignore his senses and desire and divert the energy for spiritual upliftment. An ignorant person does the contrast. That which is a night for a normal person it becomes a day for a spiritual person. The metaphorical meaning is explained as a yogi practices his or her sadhna generally in night . Because nights are more calm. It is only an example. For a yogi time is behind and he is far ahead from time.