One verse

Srimad Bhagavatam 6.12.21

6.12.21

खल्विदं महदाश्चर्यं यद् रज:प्रकृतेस्तव । वासुदेवे भगवति सत्त्वात्मनि दृढा मति: ॥ २१ ॥

khalv idam mahad ascaryam yad rajah-prakrtes tava vasudeve bhagavati sattvatmani drdha matih

khalu
indeed
idam
this
mahat ascaryam
great wonder
yat
which
rajah
influenced by the mode of passion
prakrteh
whose nature
tava
of you
vasudeve
in Lord Krsna
bhagavati
the Supreme Personality of Godhead
sattva-atmani
who is situated in pure goodness
drdha
firm
matih
consciousness.

O Vrtrasura, demons are generally conducted by the mode of passion. Therefore, what a great wonder it is that although you are a demon, you have adopted the mentality of a devotee and have fixed your mind on the Supreme Personality of Godhead, Vasudeva, who is always situated in pure goodness.