One verse

Srimad Bhagavatam 6.14.7

6.14.7

अत्र न: संशयो भूयाञ्छ्रोतुं कौतूहलं प्रभो । य: पौरुषेण समरे सहस्राक्षमतोषयत् ॥ ७ ॥

atra nah samsayo bhuyan chrotum kautuhalam prabho yah paurusena samare sahasraksam atosayat

atra
in this connection
nah
our
samsayah
doubt
bhuyan
great
srotum
to hear
kautuhalam
eagerness
prabho
O my lord
yah
he who
paurusena
by bravery and strength
samare
in battle
sahasra-aksam
Lord Indra, who has one thousand eyes
atosayat
pleased.

My dear lord, Sukadeva Gosvami, although Vrtrasura was a sinful demon, he showed the prowess of a most exalted ksatriya and satisfied Lord Indra in battle. How could such a demon be a great devotee of Lord Krsna? These contradictions have caused me great doubt, and they have made me eager to hear of this from you.