416
Śrīmad-Bhāgavatam
[Canto 5, Ch. 12]
jñānam —the supreme knowledge;  viśuddham —without contamination;  parama-artham —giving the ultimate goal of life;  ekam —unified;  anantaram —without interior, unbroken;  tu —also;  abahiḥ —without exterior;  brahma —the Supreme;  satyam —Absolute Truth;  pratyak —inner;  praśāntam —the calm and peaceful Supreme Lord, worshiped by the  yogīs ;  bhagavat-śabda-samjñam —known in the higher sense as Bhagavān, or full of all opulences;  yat —that;  vāsudevam —Lord Kṛṣṇa, the son of Vasudeva;  kavayaḥ —the learned scholars;  vadanti —say.
TRANSLATION
What, then, is the ultimate truth? The answer is that nondual knowledge is the ultimate truth. It is devoid of the contamination of material qualities. It gives us liberation. It is the one without a second, all-pervading and beyond imagination. The first realization of that knowledge is Brahman. Then Paramātmā, the Supersoul, is realized by the  yogīs  who try to see Him without grievance. This is the second stage of realization. Finally, full realization of the same supreme knowledge is realized in the Supreme Person. All learned scholars describe the Supreme Person as Vāsudeva, the cause of Brahman, Paramātmā and others.
PURPORT
In  Caitanya-caritāmṛta  it is said:  yad advaitam brahmopaniṣadi tad apy asya tanu-bhā . The impersonal Brahman effulgence of the Absolute Truth consists of the bodily rays of the Supreme Personality of Godhead.  Ya ātmāntaryāmī puruṣa iti so 'syāmśa-vibhavaḥ . What is known as  ātmā  and  antaryāmī , the Supersoul, is but an expansion of the Supreme Personality of Godhead.  Śaḍ-aiśvaryaiḥ pūrṇo ya iha bhagavān sa svayam ayam . What is described as the Supreme Personality of Godhead, complete with all six opulences, is Vāsudeva, and Śrī Caitanya Mahāprabhu is nondifferent from Him. Great learned scholars and philosophers accept this after many, many births.  Vāsudevaḥ sarvam iti sa mahātmā sudurlabhaḥ  (Bg. 7.19). The wise man can understand that ultimately Vāsudeva, Kṛṣṇa, is the cause of Brahman, and Paramātmā, the Supersoul. Thus Vāsudeva is  sarva-kāraṇa-kāraṇam , the cause of all causes. This is confirmed in  Śrīmad-Bhāgavatam . The real  tattva , Ab-