Śrīmad-Bhāgavatam · Text 8.23.29
Who is speaking and story frame
पारं महिम्न उरुविक्रमतो गृणानो
य: पार्थिवानि विममे स रजांसि मर्त्य: ।
किं जायमान उत जात उपैति मर्त्य
इत्याह मन्त्रदृगृषि: पुरुषस्य यस्य ॥ २९ ॥
pāraṁ mahimna uruvikramato gṛṇāno
yaḥ pārthivāni vimame sa rajāṁsi martyaḥ
kiṁ jāyamāna uta jāta upaiti martya
ity āha mantra-dṛg ṛṣiḥ puruṣasya yasya
One who is subject to death cannot measure the glories of the Supreme Personality of Godhead, Trivikrama, Lord Viṣṇu, any more than he can count the number of atoms on the entire planet earth. No one, whether born already or destined to take birth, is able to do this. This has been sung by the great sage Vasiṣṭha.
Read Śrīla Prabhupāda's purport on Vedabase.io