7. Relationship of Isopanisad with Bhagavad-Gita:

The instructions of Sri Isopanisad are more elaborately explained in the Bhagavad-gita, sometimes called the Gitopanisad, the cream of all the Upanisads.

(Iso 2)

8. Authorship of Isopanishad:

Regarding your first question, who is the speaker of Isopanisad? The speaker is the Vedas personified. In the Vedic age a disciple heard from the Spiritual Master messages which were coming down in disciplic succession, so a disciple, whatever he heard from his bonafide Spiritual Master, would recite. The Vedic mantras are known as Sruti, to hear from authoritative source and then repeat it, chanting. So there is no question of who wrote it, it is said that no human being has compiled them. Later on, before the beginning of Kali Yuga, all Vedic mantras were written in books, most of them were done by Srila Vyasadeva Mahamuni and his different disciples.

(70-04-28.Cit Letter: Citsukhananda)

9. Isopanisad should be understood according to its original statements:

Here Sri Caitanya Mahaprabhu confirms that all Vedic literature, including the Upanisads, Brahma-sutra and others, whether sruti, smrti or nyaya, must be understood according to their original statements. To describe the direct meaning of the Vedic scriptures is glorious, but to describe them in one's own way, using imperfect senses and imperfect knowledge, is a disastrous blunder. Sri Caitanya Mahaprabhu fully deprecated the attempt to describe the Vedas in this way.

10. The method of translation and commentary of Isopanisad by Srila Prabhupada makes the book authentic and scholarly and makes the meaning self evident:

In all of my other books--Srimad-Bhagavatam, Sri Isopanisad, etc.--the system is that I give the original verse, its English transliteration, word-for-word Sanskrit-English equivalents, translations and purports. This makes the book very authentic and scholarly and makes the meaning self-evident.

(Preface Bhagavad-Gita)

11. The basic philosophy of Isopanisad:

Any sincere gentleman serious about knowing God-Consciousness must read this book. A little education will make every one aware what is meant by God. It is a challenge to the atheists, agnostic, skeptics and gross materialists.

(70-02-18.Kir Letter: Kirtanananda)

As mentioned above, the cosmic creation is the property of the Supreme Lord. This is the basic philosophy of Isopanisad: everything is the property of the Supreme Being. No one should encroach upon the property of the Supreme Lord. One should accept only what is kindly awarded by Him. Therefore, the earth or any other planet or universe is the absolute property of the Lord. The living beings are certainly His parts and parcels, or sons, and thus every one of them has a right to live at the mercy of the Lord to execute his prescribed work. No one, therefore, can encroach upon the right of another individual man or animal without being so sanctioned by the Lord.

(SB 1.10.25 P Departure of Lord Krsna for Dvaraka)

We have tried to discuss the nature of God's greatness and our relationship to Him as preliminary chapter of Krishna Consciousness. So this book is the cheapest of all our other books and they can easily be introduced for mass reading and they will be benefited undoubtedly.

(70-01-14.Hay Letter: Hayagriva)

I have tried to explain in this book the preliminary knowledge of God-consciousness so any layman who reads it will be able to understand our Krsna Consciousness movement to their great benefit.

(70-03-09.Rud Letter: Rudra)

When one is Krishna Conscious possessing everything in the world, he is perfect spiritualist, and one may have renounced everything in the world, but lacking in Krishna Consciousness he is a gross materialist. In my recent publication of Isopanisad I have tried to explain this fact on Vedic authorities, and I am sending by separate Air Parcel one copy of Isopanisad and I hope you will read this book conveniently with interest.

(70-04-23.Sri Letter: Sri Birlaji)