One verse

Srimad Bhagavatam 4.12.17

4.12.17

तस्यां विशुद्धकरण: शिववार्विगाह्य बद्ध्वासनं जितमरुन्मनसाहृताक्ष: । स्थूले दधार भगवत्प्रतिरूप एतद् ध्यायंस्तदव्यवहितो व्यसृजत्समाधौ ॥ १७ ॥

tasyam visuddha-karanah siva-var vigahya baddhvasanam jita-marun manasahrtaksah sthule dadhara bhagavat-pratirupa etad dhyayams tad avyavahito vyasrjat samadhau

tasyam
in Badarikasrama
visuddha
purified
karanah
his senses
siva
pure
vah
water
vigahya
bathing in
baddhva
having fixed
asanam
sitting position
jita
controlled
marut
breathing process
manasa
by the mind
ahrta
withdrawn
aksah
his senses
sthule
physical
dadhara
he concentrated
bhagavat-pratirupe
on the exact form of the Lord
etat
the mind
dhyayan
meditating upon
tat
that
avyavahitah
without stopping
vyasrjat
he entered
samadhau
into trance

In Badarikasrama Dhruva Maharaja’s senses became completely purified because he bathed regularly in the crystal-clear purified water. He fixed his sitting position and by yogic practice controlled the breathing process and the air of life; in this way his senses were completely withdrawn. Then he concentrated his mind on the arca-vigraha form of the Lord, which is the exact replica of the Lord and, thus meditating upon Him, entered into complete trance.