He (Pariksit Maharaja) said that even greatly learned scholars fail to know about that, even after great effort. The Lord is unlimited, and His activities are also unfathomed

Expressions researched:
"He said therefore that even greatly learned scholars fail to know about that, even after great effort. The Lord is unlimited, and His activities are also unfathomed"

Srimad-Bhagavatam

SB Canto 2

Mahārāja Parīkṣit's statement regarding the workings of the creative energy of the Lord discloses that he knew everything of the process of creation. Why then did he ask Śukadeva Gosvāmī for such information? Mahārāja Parīkṣit, being a great emperor, a descendant of the Pāṇḍavas and a great devotee of Lord Kṛṣṇa, was quite able to know considerably about the creation of the world, but that much knowledge was not sufficient. He said therefore that even greatly learned scholars fail to know about that, even after great effort. The Lord is unlimited, and His activities are also unfathomed.

SB 2.4.8, Translation and Purport

O learned brāhmaṇa, the transcendental activities of the Lord are all wonderful, and they appear inconceivable because even great endeavors by many learned scholars have still proved insufficient for understanding them.

The acts of the Supreme Lord, in the creation of just this one universe, appear inconceivably wonderful. And there are innumerable universes, and all of them aggregated together are known as the created material world. And this part of His creation is only a fractional portion of the complete creation