only because of identification with the limiting adjunct
अनुभातिanubhāti
emulates
उपाधि–धर्मान्upādhi–dharmān
the properties of the limiting adjunct
तद्–गुणःtad–guṇaḥ
acts with those traits
अविकारि वह्निवत्avikāri vahnivat
just as fire which is immutable
अयो–विकारान्ayo–vikārān
emulates the changing forms of iron
सदा एक–रूपःsadā eka–rūpaḥ
always unchanging in nature
परः अपिparaḥ api
though being Supreme
स्वभावात्svabhāvāt
in its nature
Translation
It is only due to identification with the limiting adjunct (intellect sheath) that the Supreme Atman, though being Supreme and always unchanging in nature, emulates the properties of the limiting adjunct and acts with those characteristics; just as fire which has no form, emulates the changing forms of iron.
Annotation
‘Emulating the properties of the limiting adjunct’ – implies that the Atman assumes doership and entertains the notion of being happy, being sad etc. Fire, by itself has no form but appears as a hot iron rod or a hot iron ball (Jagadguru).