Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 1
सूत उवाचनिशम्य कौषारविणोपवर्णितंध्रुवस्य वैकुण्ठपदाधिरोहणम् । प्ररूढभावो भगवत्यधोक्षजेप्रष्टुं पुनस्तं विदुर: प्रचक्रमे ॥ १ ॥
sūta uvācaniśamya kauṣāraviṇopavarṇitaṁdhruvasya vaikuṇṭha-padādhirohaṇamprarūḍha-bhāvo bhagavaty adhokṣajepraṣṭuṁ punas taṁ viduraḥ pracakrame
Sūta Gosvāmī, continuing to speak to all the ṛṣis, headed by Śaunaka, said: After hearing Maitreya Ṛṣi describe Dhruva Mahārāja’s ascent to Lord Viṣṇu’s abode, Vidura became very much enlightened in devotional emotion, and he inquired from Maitreya as follows.
As evidenced in the topics between Vidura and Maitreya, the activities of the Supreme Personality of Godhead and the devotees are so fascinating that neither the devotee who is describing them nor the devotee who is hearing is at all fatigued by the inquiries and answers. Transcendental subject matter is so nice that no one becomes tired of hearing or speaking. Others, who are not devotees, may think, “How can people devote so much time simply to talks of God?” But devotees are never satisfied or satiated in hearing and speaking about the Supreme Personality of Godhead or about His devotees. The more they hear and talk, the more they become enthusiastic to hear. The chanting of the Hare Kṛṣṇa mantra is simply the repetition of three words — Hare, Kṛṣṇa and Rāma — but still devotees can go on chanting this Hare Kṛṣṇa mantra twenty-four hours a day without feeling fatigued.