Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 23

Sanskrit:

एष तेऽभिहित: कृत्‍स्‍नो ब्रह्मवादस्य सङ्ग्रह: ।समासव्यासविधिना देवानामपि दुर्गम: ॥ २३ ॥

ITRANS:

eṣa te ’bhihitaḥ kṛtsnobrahma-vādasya saṅgrahaḥsamāsa-vyāsa-vidhinādevānām api durgamaḥ

Translation:

Thus have I related to you — both in brief and in detail — a complete survey of the science of the Absolute Truth. Even for the demigods, this science is very difficult to comprehend.

Purport:

The word devānām indicates those living beings in the mode of goodness (such as demigods, saints and pious philosophers) who nevertheless cannot understand the Absolute Truth because they lack full surrender to the Personality of Godhead.