SB 4.29.38

so ’cirād eva rājarṣe
 syād acyuta-kathāśrayaḥ
śṛṇvataḥ śraddadhānasya
 nityadā syād adhīyataḥ
Word for word: 
saḥ — that; acirāt — very soon; eva — certainly; rāja-ṛṣe — O best of kings; syāt — becomes; acyuta — of the Supreme Personality of Godhead; kathā — narrations; āśrayaḥ — depending on; śṛṇvataḥ — of one who is hearing; śraddadhānasya — faithful; nityadā — always; syāt — becomes; adhīyataḥ — by cultivation.
Translation: 
O best of kings, one who is faithful, who is always hearing the glories of the Supreme Personality of Godhead, who is always engaged in the culture of Kṛṣṇa consciousness and in hearing of the Lord’s activities, very soon becomes eligible to see the Supreme Personality of Godhead face to face.
Purport: 

Constant engagement in the transcendental loving service of Vāsudeva means constantly hearing the glories of the Lord. The principles of bhakti-yoga — śravaṇaṁ kīrtanaṁ viṣṇoḥ smaraṇaṁ pāda-sevanam/ arcanaṁ vandanaṁ dāsyaṁ sakhyam ātma-nivedanam — are the only means by which perfection can be attained. Simply by hearing of the glories of the Lord, one is elevated to the transcendental position.