this is in 4th chapter of gita
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Chapter- 4: The matter of Transcendental Knowledge
The yoga system instructed in this chapter is called sanatana-yoga, or eternal activities performed by the living entity. This yoga has two divisions of sacrificial actions: one is called sacrifice of one's material possessions, and the other is called knowledge of the self, which is pure spiritual activity. If sacrifice of one's material possessions is not directed towards spiritual realization, then such sacrifice becomes simply material. But one who performs such sacrifices with a purely spiritual objective, or in devotional service, makes a perfect sacrifice. One who works for the satisfaction of Krishna without having a desire to enjoy the fruit of activities become free from the reactions, although one may be engage in all kind of prescribed duties. Such works are true sacrifice. When we perform to spiritual activities, we find that these are also divided into two: namely, understanding of one's own self (or one's constitutional position), and the truth regarding the Supreme Personality of Godhead.
One who follows the path of Bhagavad-gita as it is can very easily understand these two important divisions of spiritual knowledge. For him there is no difficulty in obtaining perfect knowledge of the self as part and parcel of the Lord. And such understanding is beneficial, for such a person, can easily understand the transcendental activities of the Lord. In the beginning of this chapter, the transcendental activities of the Lord is discussed by the Supreme Lord Himself. The Lord periodically incarnates in to the world to deliver the pious & annihilate the miscreants. Being absolute, The Lord remembers all his incarnations. However we the limited souls, don't remember our earlier births. Those who are in knowledge of the supreme, after leaving this body, achieve Lord's abode and never comeback to this temporary world of miseries. Although the Lord has created the four divisions of human society, he does not belong to either.
The Lord emphasizes on following the footstep of great liberated souls, instead of trying to mentally speculate our own path for liberation. One who does not follow the instructions of the Gita is to be considered faithless, and to be misusing the fragmental independence awarded to him by the Lord. In spite of such instructions, one who does not understand the real nature of the Lord as the eternal, blissful, all-knowing Personality of Godhead is certainly a fool. Ignorance can be removed by gradual acceptance of the principles of Krishna consciousness. Krishna consciousness is awakened by different types of sacrifices to the demigods, sacrifice to Brahman, sacrifice in celibacy, in household life, in controlling the senses, in practicing mystic yoga, in penance, in forgoing material possessions, in studying the Vedas, and in partaking of the social institution called varnasrama-dharma. All of these are known as sacrifice, and all of them are based on regulated action. But within all these activities, the important factor is self-realization. One who seeks that objective is the real student of Bhagavad-gita, but one who doubts the authority of Krishna falls back. One is therefore advised to study Bhagavad-gita, or any other scriptures, under a bona fide spiritual master, with service and surrender. A bona fide spiritual master is in the disciplic succession from time eternal, and he does not deviate at all from the instructions of the Supreme Lord as they were imparted millions of years ago to the sun-god, from whom the instructions of Bhagavad-gita have come down to the earthly kingdom. One should, therefore, follow the path of Bhagavad-gita as it is expressed in the Gita itself and beware of self-interested people after personal aggrandizement who deviate others from the actual path. The Lord is definitely the supreme person, and His activities are transcendental. One who understands this is a liberated person from the very beginning of his study of Bhagavad-gita. Transcendental knowledge; spiritual knowledge of the soul, of God, and of their relationship- is both purifying and liberating. Such is the fruit of selfless devotional action.
dear friend,it is in 40/04 chapter i.e.AGYASHCHAASHRADDADHAANAA SANSHAYAATMAA VINASHYATI. on taking the refrence of gita says that a person who do't have faith in knowledge of brahmgyan narratted by Himself Lord krishana in gita to be followed by him.that person lost the oppertunity of brahmgyan.neither he has real peace in life nor joy.he also do't has spritual advancement.
Source(s): pabhu prashad shrimadbhagwadgita