BG Chap 15 - The result of knowing Kṛṣṇa as the supreme person
One who knows Kṛṣṇa as the Supreme Person without doubting according to what Kṛṣṇa has just taught is the knower of everything. Although various philosophers, being bewildered by māyā, may argue over what Kṛṣṇa has taught, the devotee is not bewildered. Even though the devotee may not have studied the scriptures, he is the knower of the meaning of all scriptures. Others, even though they may have studied and taught all the scriptures, are complete fools (sam mūḍhaḥ). Understanding the facts according to what Kṛṣṇa had spoken rather than according to mere dictionary definitions, a person no longer has any doubts about Kṛṣṇa’s position as the Supreme Person. Knowing the meaning of the three verses described above (15.16-18), he is the knower of everything because these three verses are the purport of the Vedas. Such a person worships Kṛṣṇa with complete love by all methods. The other person, who doubts Kṛṣṇa as the Supreme person is not a devotee even if he worships by all methods.