Bhagavad-Gita: Chapter 4, Verse 27

Rudra Vaisnava Sampradaya:

Visnuswami

Sridhara Swami's Commentary

Others refers to those in jnana yoga or cultivation of Vedic knowledge who meditate in self-purification by offering all their senses like hearing and seeing along with all their organs like the ears and eyes and offer as well the assimilation of all food and drink along with the ten vital airs and even offering the inhaling breath into the exhaling breath. Krikara is known as producing hunger, naga is to be known as eructation, kurma as opening the eyelids, devadatta is the function of yawning and dhananjaya permeates the entire physical body remining even after death. How is it that even these functions are dissolved? They are evaporated by the fire of self-control and yoga or the science of the individual consciousness communing with the ultimate consciousness. Meditation by focusing the mind on the atma or soul is yoga. This yoga is the fire that which is kindled and lit by the knowledge of the Brahman or the spiritual substratum pervading all existence. Lord Krishna purport is that by knowledge of the goal of meditation and concentrating the mind on the atma to realise it, all the functions of the body naturally induced to cease.

Brahma Vaisnava Sampradaya:

Madhvacarya

Madhvacarya's Commentary

The compound words atma-samyama-yogagnau means with the intelligence controlled by the soul by the fire of yoga or the individual consciousness in communion with the ultimate consciousness. This infers that due to spiritual wisdom and knowledge an intensity of self-restraint and determination is activated. It must be emphasised here that mere mechanical control of the senses will not bring the desired result. When the mind has achieved full knowledge and wisdom it perceives that it is no longer needs to control the senses because by discrimination the senses are naturally restrained and one becomes qualified to gain communion with the ultimate consciousness.

Sri Vaisnava Sampradaya:

Ramanuja

Ramanuja's Commentary

Others offer all the functions of the senses and all the functions of the prana or life breath along with the vital energy of the body in the fire of the purified soul ignited by knowledge. By this Lord Krishna means that such persons direct their efforts in disciplining the mind to refrain from its pursuit of sensual activities.

Kumara Vaisnava Sampradaya:

Nimbaditya

Kesava Kasmiri's Commentary

Lord Krishna speaks of more qualified yogis or one who practices the science of the individual consciousness attaining communion with the ultimate consciousness. These yogis are free from attachment to external sense objects because their senses are already under complete control. In this way they offer all their senses such as seeing and hearing and all the natural functions of the body such as speaking, eating, drinking and even breathing as they offer the inhalation into the exhalation and vice versa. Eructation of the body such as the belching sound heard from eating and drinking is to keep the body balanced by letting out air. All these things these yogis offer in the fire of self-purification because by doing so all negative effects are consumed. This allows the mind to be controlled and not diverted to extraneous things making it qualified for meditation kindled by wisdom giving firm resolve and fixed determination to achieve the goal of atma tattva or soul realisation.