One verse

Srimad Bhagavatam 3.27.22

3.27.22

ज्ञानेन द‍ृष्टतत्त्वेन वैराग्येण बलीयसा । तपोयुक्तेन योगेन तीव्रेणात्मसमाधिना ॥ २२ ॥

jnanena drsta-tattvena vairagyena baliyasa tapo-yuktena yogena tivrenatma-samadhina

jnanena
in knowledge
drsta-tattvena
with vision of the Absolute Truth
vairagyena
with renunciation
baliyasa
very strong
tapah-yuktena
by engagement in austerity
yogena
by mystic yoga
tivrena
firmly fixed
atma-samadhina
by self-absorption.

This devotional service has to be performed strongly in perfect knowledge and with transcendental vision. One must be strongly renounced and must engage in austerity and perform mystic yoga in order to be firmly fixed in self-absorption.