Neither I nor all the sages born before you know fully the omnipotent Personality of Godhead. So what can others, who are born after us, know about Him? Even the first incarnation of the Lord, namely Śeṣa, has not been able to reach the limit of such knowledge, although He is describing the qualities of the Lord with ten hundred faces.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
नान्तं विदाम्यहममी मुनयोऽग्रजास्ते मायाबलस्य पुरुषस्य कुतोऽपरे ये । गायन् गुणान् दशशतानन आदिदेवः शेषोऽधुनापि समवस्यति नास्य पारम्
nāntaṃ vidāmyahamamī munayo'grajāste māyābalasya puruṣasya kuto'pare ye | gāyan guṇān daśaśatānana ādidevaḥ śeṣo'dhunāpi samavasyati nāsya pāram
SB 2.7.41