One verse

Srimad Bhagavatam 3.7.20

3.7.20

दुरापा ह्यल्पतपस: सेवा वैकुण्ठवर्त्मसु । यत्रोपगीयते नित्यं देवदेवो जनार्दन: ॥ २० ॥

durapa hy alpa-tapasah seva vaikuntha-vartmasu yatropagiyate nityam deva-devo janardanah

durapa
rarely obtainable
hi
certainly
alpa-tapasah
of one whose austerity is meager
seva
service
vaikuntha
the transcendental kingdom of God
vartmasu
on the path of
yatra
wherein
upagiyate
is glorified
nityam
always
deva
of the demigods
devah
the Lord
jana-ardanah
the controller of the living entities.

Persons whose austerity is meager can hardly obtain the service of the pure devotees who are progressing on the path back to the kingdom of Godhead, the Vaikunthas. Pure devotees engage one hundred percent in glorifying the Supreme Lord, who is the Lord of the demigods and the controller of all living entities.