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රේඛ Calitanya-caritāmrta
[[Madhya-lilā, Ch. 6]
When one has actually become wise through the study of Vedic literature, he surrenders unto Vāsudeva, Bhagavān Śrī Kṛṣṇa. This is also confirmed in  Śrīmad-Bhāgavatam  (1.2.7-8):
vāsudeve bhagavati
bhakti-yogaḥ prayojitaḥ
janayaty āśu vairāgyaṁ
jñānaṁ ca yad ahaitukam
dharmaḥ svanuṣṭhitaḥ puṁsāṁ viṣvaksena-kathāsu yaḥ notpādayed yadi ratiṁ śrama eva hi kevalam
Understanding Vāsudeva is real knowledge. By engaging in the devotional service of Vāsudeva, Kṛṣṇa, one acquires perfect knowledge and Vedic understanding. Thus one becomes detached from the material world. This is the perfection of human life. Although one may perfectly follow religious rituals and ceremonies, he is simply wasting his time ( śrama eva hi kevalam ) if he does not attain this perfection.
Before the creation of the cosmic manifestation, the Supreme Personality of Godhead possessed His totally transcendental mind and eyes. That Supreme Personality of Godhead is Kṛṣṇa. A person may think that there is no direct statement about Kṛṣṇa in the  Upaniṣads , but the fact is that the Vedic  mantras  cannot be understood by people with mundane senses. As stated in the  Padma Purāṇa ,  ataḥ śrī kṛṣṇa nāmādi na bhaved grāhyam indriyaiḥ : a person with mundane senses cannot fully understand the name, qualities, form and pastimes of Śrī Kṛṣṇa. The  Purāṇas  are therefore meant to explain and supplement Vedic knowledge. The great sages present the  Purāṇas  in order to make the Vedic  mantras  understandable for common men ( strī-śūdra-dvija-bandhūnām ). Considering that women,  śūdras  and  dvija-bandhus  (unworthy sons of the twice-born) cannot understand the Vedic hymns directly, Śrīla Vyāsadeva compiled  Mahābhārata . Actually the Supreme Personality of Godhead is  vedeṣu durlabham  (untraceable in the  Vedas ), but when the  Vedas  are properly understood or when Vedic knowledge is received from devotees, one can understand that all Vedic knowledge leads to Śrī Kṛṣ
The  Brahma-sūtra  (1.1.3) confirms this fact also:  śāstra-yonitvāt . Commenting upon this  Brahma-sūtra  code ( śāstra-yonitvāt ), Śrī Madhvācārya says: “The  Rṣ Veda ,  Yajur Veda ,  Sāma Veda ,  Atharva Veda ,  Mahābhārata ,  Pañcarātra  and the original Vālmīki  Rāmāyaṇa  are all Vedic literature. Any literature following the conclusive statements of this Vedic literature is also to be considered Vedic literature. That literature which does not conform to Vedic literature is simply misleading.”