Bhagavad Gita Bhasya (Gambhirananada)

is derived from its being faultless in as much as it
has not originated from any human being.]: By
way of merely negating superimposition of
qualities that do not belong to the Self, it attains
authoritativeness with regard to the Self, but not
by virtue of making some unknown thing known.
There is an Upanisadic text in support of this: '...the
Brahman that is immediate and direct, the Self that
is within all' (Br. 3.4.1). Since the Self is thus eternal
and unchanging, tasmat, therefore; yudhyasva,
you join the battle, i.e. do not desist from the war.
Here there is no injunction to take up war as a
duty, because be (Arjuna), though he was
determined for war, remains silent as a result of
being overpowered by sorrow and delusion.
Therefore, all that is being done by the Lord is the
removal of the obstruction to his duty. 'Therefore,
join the battle' is only an approval, not an
injunction. The scripture Gita is intended for
eradicating sorrow, delusion, etc. which are the
cases of the cycle of births and deaths; it is not
intended to enjoin action. As evidences of this idea
the Lord cites two Vedic verses: [Ka. 1.2.19-20.
There are slight verbal differences.-Tr.]
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