Srimad Bhagavatam Canto 04, Chapter 08, Text 52

SB 4.8.52

evam bhagavato rupam
subhadram dhyayato manah
nirvrtya paraya turnam
sampannam na nivartate
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
 
One who meditates in this way, concentrating his mind upon the always auspicious form of the Lord, is very soon freed from all material contamination, and he does not come down from meditation upon the Lord.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
This fixed meditation is called samadhi, or trance. A person constantly engaged in the transcendental loving service of the Lord cannot be deviated from meditating on the form of the Lord, as described herein. The arcana-marga, or the devotional path prescribed in the Pañcaratra system of devotional service for worshiping the Deity in the temple, makes the devotee think constantly of the Lord; that is samadhi, or trance. One who practices in this way cannot deviate from the service of the Lord, and that makes him perfect in the mission of human life.
Srimad Bhagavatam Canto 04, Chapter 08, Text 51
Srimad Bhagavatam Canto 04, Chapter 08, Text 53