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Bhagavad-pāja  As It ls
[Ch 15]
Godhead;  saḥ —he;  sarva-vit —knower of everything;  bhajati —renders devotional service;  mām —unto Me;  sarva-bhāvena —in all respects;  bhārata —O son of Bharata
TRANSLATION
Whoever knows Me as the Supreme Personality of Godhead, without doubting, is to be understood as the knower of everything, and he therefore engages himself in full devotional service, O son of Bharata.
PURPORT
There are many philosophical speculations about the constitutional position of the living entities and the Supreme Absolute Truth. Now in this verse the Supreme Personality of Godhead clearly explains that anyone who knows Lord Kṛṣṇa as the Supreme Person is actually the knower of everything. The imperfect knower goes on simply speculating about the Absolute Truth, but the perfect knower, without wasting his valuable time, engages directly in Kṛṣṇa consciousness, the devotional service of the Supreme Lord. Throughout the whole of  Bhagavad-gītā , this fact is being stressed at every step. And still there are so many stubborn commentators on  Bhagavad-gītā  who consider the Supreme Absolute Truth and the living entities to be one and the same.
Vedic knowledge is called  śruti , learning by aural reception. One should actually receive the Vedic message from authorities like Kṛṣṇa and His representatives. Here Kṛṣṇa distinguishes everything very nicely, and one should hear from this source. Simply to hear like the hogs is not sufficient; one must be able to understand from the authorities. It is not that one should simply speculate academically. One should submittedly hear from  Bhagavad-gītā  that these living entities are always subordinate to the Supreme Personality of Godhead. Anyone who is able to understand this, according to the Supreme Personality of Godhead, Śrī Kṛṣṇa, knows the purpose of the  Vedas ; no one else knows the purpose of the  Vedas .
The word  bhajate  is very significant. In many places the word  bhajate  is expressed in relationship with the service of the Supreme Lord. If a person is engaged in full Kṛṣṇa consciousness in devotional service of the Lord, it is to be understood that he has understood all the Vedic knowledge. In the Vaiṣṇava  paramparā  it is said that if one is engaged in the devotional service of Kṛṣṇa, then there is no need for a spiritual process to understand the Supreme Absolute Truth. He has already come to the post