This is the sum and substance of  Bhagavad-gita .
The conclusion is that  Bhagavad-gita  is a transcendental literature that should be read very carefully. If one follows the instructions, he can be freed of all fears and sufferings in this life and attain a spiritual birth in the next life.
Another result is that if one reads  Bhagavad-gita  seriously and reverently, then the reactions of his past deeds will no longer effect him. The Lord says, in the end, that He Himself takes the responsibility to indemnify all the reactions of sins for one who comes to Him. One cleanses himself daily by bathing in water, but for one who once bathes in the sacred Ganges water of  Bhagavad-gita , the dirt of past sins is washed away for all time. If one reads  Bhagavad-gita  regularly and attentively, no other literature is needed.
In the present age, people are engaged by so many material things that they have no time to devote their energy to spiritual topics. However, one who simply reads  Bhagavad-gita  need not read any other Vedic literature.  Bhagavad-gita  is the essence of all Vedic knowledge. It is said that one who drinks the water of the Ganges will be freed from sin. Similarly, one who studies  Bhagavad-gita  needs no other literature whatever. Lord Krsna is the original Visnu, the ultimate end of all knowledge and of all seeking after knowledge, and He is present in the teaching of the  Gita .