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Śrīmad-Bhāgavatam
[Canto 10, Ch. 13
TEXT 54
सत्यज्ञानानन्तानन्दमात्रैकरसमूर्तयः । अस्पृष्टभूरिमाहात्म्या अपि ह्युपनिषद्दशाम् ॥५४॥
satya-jñānānantānanda- mātraika-rasa-mūrtayaḥ aspṛṣṭa-bhūri-māhātmyā api hy upaniṣad-dṛśām
satya—eternal; jñāna—having full knowledge; ananta—unlimited; ānanda—fully blissful; mātra—only; eka-rasa—always existing; mūrtayaḥ—forms; aspṛṣṭa-bhūri-māhātmyāḥ—whose great glory is not touched; api—even; hi—because; upaniṣat-dṛśām—by those jñānīs who are engaged in studying the Upaniṣads.
TRANSLATION
The viṣṇu-mūrtis all had eternal, unlimited forms, full of knowledge and bliss and existing beyond the influence of time. Their great glory was not even to be touched by the jñānīs engaged in studying the Upaniṣads.
PURPORT
Mere  śāstra-jñāna , or knowledge in the  Vedas , does not help anyone understand the Personality of Godhead. Only one who is favored or shown mercy by the Lord can understand Him. This is also explained in the  Upaniṣads  ( Muṇḍaka Up. 3.2.3 ):
nāyam ātmā pravacanena labhyo na medhasā na bahunā śrutena yam evaiṣa vṛṇute tena labhyas tasyaiṣa ātmā vivṛṇute tanuṁ svām
“The Supreme Lord is not obtained by expert explanations, by vast intelligence, or even by much hearing. He is obtained only by one whom He Himself chooses. To such a person, He manifests His own form.”