and of the activities done by the body, senses and vital airs
अनु–वर्तमानःanu–vartamānaḥ
indwelling all
तान्tān
all those
अग्नि–वत्agni–vat
like fire
अयःayaḥ
the iron (ball)
न चेष्टतेna ceṣṭate
does not act
न विकरोतिna vikaroti
does not cause change
किञ्चनkiñcana
even a bit
Translation
Atman is the knower of the modifications of the mind and the ego and of the activities done by the body, senses and vital airs. It indwells (pervades) all (such modifications and activities) like fire pervades the iron ball. It does not act nor cause any change.
Annotation
1) ‘The knower’ – Atman is the illuminor of all modifications of mind such as desire, volition etc., 2) The fire by itself does not have any form but it pervades the iron throughout and appears as associated with its functions. 3) ‘Does not cause change’ – It has no active role on its part but acts like Sun which illumines all by its mere presence (Jagadguru).