SB 1.15.28

sūta uvāca
evaṁ cintayato jiṣṇoḥ
 kṛṣṇa-pāda-saroruham
sauhārdenātigāḍhena
 śāntāsīd vimalā matiḥ
Word for word: 
sūtaḥ uvāca — Sūta Gosvāmī said; evam — thus; cintayataḥ — while thinking of the instructions; jiṣṇoḥ — of the Supreme Personality of Godhead; kṛṣṇa-pāda — the feet of Kṛṣṇa; saroruham — resembling lotuses; sauhārdena — by deep friendship; ati-gāḍhena — in great intimacy; śāntā — pacified; āsīt — it so became; vimalā — without any tinge of material contamination; matiḥ — mind.
Translation: 
Sūta Gosvāmī said: Thus being deeply absorbed in thinking of the instructions of the Lord, which were imparted in the great intimacy of friendship, and in thinking of His lotus feet, Arjuna’s mind became pacified and free from all material contamination.
Purport: 

Since the Lord is absolute, deep meditation upon Him is as good as yogic trance. The Lord is nondifferent from His name, form, quality, pastimes, entourage and specific actions. Arjuna began to think of the Lord’s instructions to him on the Battlefield of Kurukṣetra. Only those instructions began to eliminate the tinges of material contamination in the mind of Arjuna. The Lord is like the sun; the sun’s appearance means immediate dissipation of darkness, or ignorance, and the Lord’s appearance within the mind of the devotee can at once drive away the miserable material effects. Lord Caitanya has therefore recommended constant chanting of the name of the Lord for protection from all contamination of the material world. The feeling of separation from the Lord is undoubtedly painful to the devotee, but because it is in connection with the Lord, it has a specific transcendental effect which pacifies the heart. Feelings of separation are also sources of transcendental bliss, and they are never comparable to contaminated material feelings of separation.