Śrīmad-Bhāgavatam · Text 5.26.38
Who is speaking and story frame
निवृत्तिलक्षणमार्ग आदावेव व्याख्यात: । एतावानेवाण्डकोशो यश्चतुर्दशधा पुराणेषु विकल्पित उपगीयते यत्तद्भगवतो नारायणस्य साक्षान्महापुरुषस्य स्थविष्ठं रूपमात्ममायागुणमयमनुवर्णितमादृत: पठति शृणोति श्रावयति स उपगेयं भगवत: परमात्मनोऽग्राह्यमपि श्रद्धाभक्तिविशुद्धबुद्धिर्वेद ॥ ३८ ॥
nivṛtti-lakṣaṇa-mārga ādāv eva vyākhyātaḥ; etāvān evāṇḍa-kośo yaś caturdaśadhā purāṇeṣu vikalpita upagīyate yat tad bhagavato nārāyaṇasya sākṣān mahā-puruṣasya sthaviṣṭhaṁ rūpam ātmamāyā-guṇamayam anuvarṇitam ādṛtaḥ paṭhati śṛṇoti śrāvayati sa upageyaṁ bhagavataḥ paramātmano ’grāhyam api śraddhā-bhakti-viśuddha-buddhir veda.
In the beginning [the second and third cantos of Śrīmad-Bhāgavatam] I have already described how one can progress on the path of liberation. In the Purāṇas the vast universal existence, which is like an egg divided into fourteen parts, is described. This vast form is considered the external body of the Lord, created by His energy and qualities. It is generally called the virāṭ-rūpa. If one reads the description of this external form of the Lord with great faith, or if one hears about it or explains it to others to propagate bhāgavata-dharma, or Kṛṣṇa consciousness, his faith and devotion in spiritual consciousness, Kṛṣṇa consciousness, will gradually increase. Although developing this consciousness is very difficult, by this process one can purify himself and gradually come to an awareness of the Supreme Absolute Truth.
Read Śrīla Prabhupāda's purport on Vedabase.io