Shri Krishna says to Arjun that there are two types of fire offerings. One is bhoutik and another is boudhhik. The first one is done by external rituals like offering butter and all in fire and the second one is completely internal. This is done through wisdom and knowledge. By controlling the senses and desire , by reflecting on Brahma this is done. Questions like who am I , what is soul .. a sadhak goes on this path.

There is a detailed , elaborated description of various yajnas in Veda and Upanishad.Sri Krishna says to Arjun, O Arjun please do practise them to attain liberation and mokhya. You can be released from karma bandhan.

Shri Krishna says O ARJUN the one who realizes the true wisdom through yajna and sadhna is liberated ultimately.But the rest who do not do any kind of yajna and sadhna will never be peaceful and happy in life.

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.