Fire transforms the nature of things consigned into it. In external ritualistic Vedic sacrifices, it physically consumes oblations offered to it. In the internal practice of spirituality, fire is symbolic. The fire of self-discipline burns the desires of the senses.
Here, Shree Krishna distinguishes between two diametrically opposite approaches to spiritual elevation. One is the path of negation of the senses, which is followed in the practice of
haṭha yog
. In this type of
yajña
(sacrifice), the actions of the senses are suspended, except for the bare maintenance of the body. The mind is completely withdrawn from the senses and made introvertive, by force of will-power.
Opposite to this is the practice of
bhakti yog
. In this second type of
yajña
, the senses are made to behold the glory of the Creator that manifests in every atom of his creation. The senses no longer remain as instruments for material enjoyment; rather they are sublimated to perceive God in everything. In verse 7.8, Shree Krishna says
raso ‘ham apsu kaunteya
“Arjun, know me to be the taste in water.” Accordingly,
bhakti yogis
practice to behold God through all their senses, in everything they see, hear, taste, feel, and smell. This
yajña
of devotion is simpler than the path of
haṭha yog
; it is joyous to perform, and involves a smaller risk of downfall from the path. If one is riding a bicycle and presses the brakes to stop the forward motion, he will be in an unstable condition, but if the cyclist simply turns the handle to the left or right, the bicycle will very easily stop its forward motion and still remain stably balanced.