From the beginning of the book:
His Divine Grace A.C. Bhaktivedanta Swami Prabhupada is the present acarya or teacher by example in the unbroken chain of disciplic succession begun five thousand years ago by Lord Sri Krsna, the Supreme Personality of Godhead. His is the founder and spiritual master of the International Society for Krishna Consciousness, which now has thousands of members and over ninety centers around the world. Srila Prabhupada came to the United States seven years ago under the instruction of his spiritual master, who requested that the ancient knowledge of the Vedic literatures be given to the English speaking world. Thus Srila Prabhupada is now freely distributing this pure transcendental knowledge, which is the real wealth of India, the eternal teaching of man’s relationship to the Supreme.
Krsna— this sound is transcendental. Krsna means the highest pleasure. All of us, every living being, seeks pleasure. But we do not know how to seek pleasure perfectly. With a materialistic concept of life, we are frustrated at every step in satisfying our pleasure because we have no information regarding the real level on which to have real pleasure. For the last few weeks we have been learning that we are not this body; we are consciousness. Not exactly consciousness, for consciousness is actually the symptom of our real identity: we are pure soul, now merged within this material body. Modern material science lays no stress on this; therefore the scientists are sometimes misled in their understanding of spirit soul. But spirit soul is a fact, which anyone can understand by the presence of consciousness. Any child can understand that consciousness is the symptom of the spirit soul.
Now the whole process we are trying to learn from the Bhagavad-gita (The Song of God) is how to bring ourselves to this level of consciousness. And if we act from the level of consciousness, then we may not be pushed again into the level of this bodily conception; and, if we can continue on that level, if we can continue to act in pure consciousness, then, at the end of this body we shall be free from material contamination, our spiritual life will be revived, and the ultimate result will be that in our next life, after leaving this body, we shall have our full, eternal spiritual life. Spirit, as we have already discussed, is described as eternal.