One verse

Srimad Bhagavatam 3.1.44

3.1.44

अजस्य जन्मोत्पथनाशनाय कर्माण्यकर्तुर्ग्रहणाय पुंसाम् । नन्वन्यथा कोऽर्हति देहयोगं परो गुणानामुत कर्मतन्त्रम् ॥ ४४ ॥

ajasya janmotpatha-nasanaya karmany akartur grahanaya pumsam nanv anyatha ko ’rhati deha-yogam paro gunanam uta karma-tantram

ajasya
of the unborn
janma
appearance
utpatha-nasanaya
for the sake of annihilating the upstarts
karmani
works
akartuh
of one who has nothing to do
grahanaya
to take up
pumsam
of all persons
nanu anyatha
otherwise
kah
who
arhati
may deserve
deha-yogam
contact of the body
parah
transcendental
gunanam
of the three modes of nature
uta
what to speak of
karma-tantram
the law of action and reaction

The appearance of the Lord is manifested for the annihilation of the upstarts. His activities are transcendental and are enacted for the understanding of all persons. Otherwise, since the Lord is transcendental to all material modes, what purpose could He serve by coming to earth?