Answer: - In Gita Chapter 4 Verse 25 to 30, the speaker of the knowledge of Gita has told that – O Arjun! All the worshippers perform their religious practices considering them to be destroyer of sins, that is, giver of salvation. If they had this assurance that the worship they are doing is not in accordance with the scriptures, they would leave the worship. Like, many worshippers consider worship to be the performance of religious rituals of gods. Others only worship Brahm. Many perform religious ritual by pouring ghee into fire; it is called Hawan. (Gita Chapter 4 Verse 25)
Other devotees perform rituals by closing eyes, ears and mouth. They sacrifice, that is, end their human life in that only. (Gita Chapter 4 Verse 26)
Other devotees worship by focussing their attention on the incoming and the outgoing air while breathing; they sacrifice, that is, end their life in the fire of practice of self-retraint. They consider their way of worship to be the lamp of knowledge, that is, to be the best. (Gita Chapter 4 Verse 27)
Some other devotees perform yagyas, that is, religious rituals through money e.g. provide (bhandara) free food to laymen, distribute clothes and blankets, build inns and free water-kiosks etc. They perform these yagyas. Some do penance (meditate); some perform Yogasanas. They consider these to be the way of worship for attaining God. Many worshippers practice strict vows of non-violence e.g. covering the mouth with a piece of cloth and walking barefoot, fasting for several days etc. Other devotees do self-study, that is, they daily read some (mantras) verses from a holy book like Ved; this is called Gyan Yagya. They believe that these practices lead to salvation. (Gita Chapter 4 Verse 28)
Other devotees perform the action of offering their incoming air to the outgoing air. Contrary to this, some devotees peform the action of offering the outgoing air to the incoming air. Many worshippers restrict their food intake.
Some perform activities like Yog etc. For example, worshippers, who are engrossed in Pranayam, stopping the flow of incoming and outgoing air reduce their breaths. They sacrifice, that is, dedicate their human life to this alone. All these abovementioned (Chapter 4 Verses 25 to 30) worshippers by performing their respective yagyas, that is, religious rituals believe that they are peforming a religious practice that destroys sins. (Gita Chapter 4 Verse 30)
If the way of worship of the worshipper is according to the scriptures, then O best of Kurus, Arjun! The worshippers, who eat the blessed food from this Yagya, attain the Eternal Brahm, that is, Param Akshar Brahm, and for those, who do not perform Yagya, that is, Scripture-based way of worship, even this earth is not pleasurable, then how can (Parlok) another world be enjoyable, meaning that scripture-opposed worshipper does not get any benefit. This evidence is also in Gita Chapter 16 Verse 23-24. (Gita Chapter 4 Verse 31)
The speaker of Gita has clarified in the verses 25 to 30 above that whatever worship a worshipper is doing, he/she is doing it considering it to be true and the giver of salvation. But in Verse 32 of Gita Chapter 4 itself, he has told that “(BrahmnH Mukhe) Param Akshar Brahm imparts the true knowledge of the yagyas, that is, religious rituals by himself uttering from his lotus-mouth. {It is called the speech of the Sachidanand Ghan Brahm (True-happiness- giving God), that is, Param Akshar Brahm. It is also called Tatvgyan (complete spiritual knowledge). It is also called the Fifth Ved (Sukshm Ved).} The way of worship has been described in detail in that Tatvgyan (complete spiritual knowledge). Knowing it, a worshipper becomes free from all the sins, that is, attains complete salvation.
Note: In the translation of Gita Chapter 4 Verse 32, all the translators have committed the same mistake. They have written the meaning of word “BrahmnH” as “Ved”. They have written the meaning of “Brahmne Mukhe” as “in the speech of Ved”, which is wrong. The same translators in Gita Chapter 17 Verse 23 have written the meaning of “BrahmnH” as “Sachidanand Ghan Brahm”, which is correct. Therefore, even in Gita Chapter 4 Verse 32 it is appropriate to interpret the meaning of “BrahmnH” as “Sachidanand Ghan Brahm” i.e. Param Akshar Brahm.
In Gita Chapter 4 Verse 34, the speaker of Gita has stated that you may understand that knowledge (the knowedge that God imparts by uttering from his lotus-mouth, the Tatvgyan) by going to Tatvdarshi saints. By prostrating before them, and politely asking questions without any deceit, those Tatvdarshi saints will give you instruction of Tatvgyan.
This also proves that the knowledge of Gita is not complete, but it is also not wrong. Even the Giver of the knowledge of Gita does not have the knowledge of the path of complete salvation because the Giver of the knowledge of Gita does not have the information about the Tatvgyan which God (Param Akshar Brahm) utters from his mouth. He has advised to know it from the Tatvdarshi saints.
This very evidence is also given in Yajurved Chapter 4 Mantra 10. It is said that some consider the Param Akshar Brahm to be “Sambhavat”, that is, to be born in form like Ram-Krishna. Some consider him “Asambhavat”, that is, God is not born; He is formless. Whether God takes birth or not; what is He actually like? “Dheeranam” Tatvdarshi saints give this knowledge. Listen to them.