Srimad-Bhagavatam: Canto 12 - Chapter 1 - Verse 51
Sanskrit:
न यद् वचश्चित्रपदं हरेर्यशोजगत्पवित्रं प्रगृणीत कर्हिचित् ।तद् ध्वाङ्क्षतीर्थं न तु हंससेवितंयत्राच्युतस्तत्र हि साधवोऽमला: ॥ ५१ ॥
ITRANS:
na yad vacaś citra-padaṁ harer yaśojagat-pavitraṁ pragṛṇīta karhicittad dhvāṅkṣa-tīrthaṁ na tu haṁsa-sevitaṁyatrācyutas tatra hi sādhavo ’malāḥ
Translation:
Those words that do not describe the glories of the Lord, who alone can sanctify the atmosphere of the whole universe, are considered to be like unto a place of pilgrimage for crows, and are never resorted to by those situated in transcendental knowledge. The pure and saintly devotees take interest only in topics glorifying the infallible Supreme Lord.