One verse

Srimad Bhagavatam 6.14.2

6.14.2

देवानां शुद्धसत्त्वानामृषीणां चामलात्मनाम् । भक्तिर्मुकुन्दचरणे न प्रायेणोपजायते ॥ २ ॥

devanam suddha-sattvanam rsinam camalatmanam bhaktir mukunda-carane na prayenopajayate

devanam
of the demigods
suddha-sattvanam
whose minds are purified
rsinam
of great saintly persons
ca
and
amala-atmanam
who have purified their existence
bhaktih
devotional service
mukunda-carane
to the lotus feet of Mukunda, the Lord, who can give liberation
na
not
prayena
almost always
upajayate
develops.

Demigods situated in the mode of goodness and great saints cleansed of the dirt of material enjoyment hardly ever render pure devotional service at the lotus feet of Mukunda.