Mahabharata Udyoga Parva Chapter 43:5

Mahabharata Udyoga Parva (Sanat-sujata Parva) Chapter 43:5 There is none who hath truly caught the sense of the Vedas or there may be some who have, O king, caught the sense. He that hath only read the Vedas, doth not know the Object knowable by them. He, however, that is established in Truth, knows the Object knowable by the Vedas. Amongst those faculties which lead to perception of the body as the acting agent, there is none by which true knowledge may be acquired. By the mind alone one cannot acquire the knowledge of Self and Not-Self. Indeed, he that knoweth Self also knoweth what is Not-self. He, on the other hand, that knoweth only what is Not-self, doth not know Truth. He, again, that knoweth the proofs, knoweth also that which is sought to be proved. But what that Object in its nature is (which is sought to be proved) is not known to either the Vedas or those that are acquainted with the Vedas. For all that, however, those Brahmanas that are (truly) acquainted with the Vedas succeed in obtaining a knowledge of the Object knowable (by the Vedas) through the Vedas. As the branch of a particular tree is sometimes resorted to for pointing out the lunar digit of the first day of the lighted fortnight so the Vedas are used for indicating the highest attributes of the Supreme Soul. I know him to be a Brahmana (possessing a knowledge of Brahman) who expoundeth the doubts of others, having himself mastered all his own doubts, and who is possessed of the knowledge of Self. One cannot find what the Soul is by seeking in the East, the South, the West, the North, or in the subsidiary directions or horizontally. Very rarely can it be found in him who regardeth this body to be the Self. Beyond the conception of even the Vedas, the man of Yoga-meditation only can behold the Supreme. Completely restraining all thy senses and thy mind also seek thou that Brahman which is known to reside in thy own Soul. He is not a Muni who practiseth only Yoga-meditation; nor he who liveth only in the woods (having retired from the world). He, however, is a Muni and is superior to all who knoweth his own nature. In consequence of one's being able to expound every object (Vyakarana), one is said to be endued with universal knowledge (Vaiyakarana); and, indeed, the science itself is called Vyakarana owing to its being able to expound every object to its very root (which is Brahman). The man who beholdeth all the regions as present before his eyes, is said to be possessed of universal knowledge. He that stayeth in Truth and knoweth Brahman is said to be a Brahmana, and a Brahmana possesseth universal knowledge. A Kshatriya also, that practises such virtues, may behold Brahman. He may also attain to that high state by ascending step by step, according to what is indicated in the Vedas. Knowing it for certain, I tell thee this.