Bhagavatapurana 8.23.28.p1

8.23.28.p1

pāraṃ mahimna uruvikramato gṛṇāno $ yaḥ pārthivāni vimame sa rajāṃsi martyaḥ &

29. He who presumes to sing exhaustively the glories of the Almighty Lord is like unto a mortal who would reckon all the particles of the earth (dust); therefore the Rishi who has a direct revelation of the Mantra says “No mortal already born or born now (or one that will ever be born) could make approaches to Thy glory.