SB 8.1.32

tat-kathāsu mahat puṇyaṁ
 dhanyaṁ svastyayanaṁ śubham
yatra yatrottamaśloko
 bhagavān gīyate hariḥ
Synonyms: 
tat-kathāsu — in those narrations; mahat — great; puṇyam — pious; dhanyam — glorious; svastyayanam — auspicious; śubham — all good; yatra — whenever; yatra — wherever; uttamaślokaḥ — the Lord, who is known as Uttamaśloka (He who is described by transcendental literature); bhagavān — the Supreme Personality of Godhead; gīyate — is glorified; hariḥ — the Supreme Personality of Godhead.
Translation: 
Any literature or narration in which the Supreme Personality of Godhead, Uttamaśloka, is described and glorified is certainly great, pure, glorious, auspicious and all good.
Purport: 

The Kṛṣṇa consciousness movement is spreading all over the world simply by describing Kṛṣṇa. We have published many books, including Śrī Caitanya-caritāmṛta in seventeen volumes, four hundred pages each, as well as Bhagavad-gītā and The Nectar of Devotion. We are also publishing Śrīmad-Bhāgavatam in sixty volumes. Wherever a speaker holds discourses from these books and an audience hears him, this will create a good and auspicious situation. Therefore the preaching of Kṛṣṇa consciousness must be done very carefully by the members of the Kṛṣṇa consciousness movement, especially the sannyāsīs. This will create an auspicious atmosphere.