Lord Krsna's absolute position.
"… Our business is to present the will of Krsna, not that of any mundane speculator like the politician, philosopher or scientist, for they have very little knowledge of Krsna, despite all their other knowledge. When Krsna says, man-manā bhava mad-bhakto mad-yājī mām namaskuru, etc., we, unlike the so-called scholars, do not say that Krsna and His inner spirit are different. Krsna is absolute, and there is no difference between Krsna's name, Krsna's form, Krsna's quality, Krsna's pastimes, etc. This absolute position of Krsna is difficult to understand for any person who is not a devotee of Krsna in the paramparā (disciplic succession) system. Generally the so-called scholars, politicians, philosophers, and svāmīs, without perfect knowledge of Krsna, try to banish or kill Krsna when writing commentary on Bhagavad-gītā…"

Historical descent of Lord Krsna.
"...Our only purpose is to present this Bhagavad-gītā As It Is in order to guide the conditioned student to the same purpose for which Krsna descends to this planet once in a day of Brahmā, or every 8,600,000,000 years. This purpose is stated in Bhagavad-gītā, and we have to accept it as it is; otherwise there is no point in trying to understand the Bhagavad-gītā and its speaker, Lord Krsna. Lord Krsna first spoke Bhagavad-gītā to the sun-god some hundreds of millions of years ago. We have to accept this fact and thus understand the historical significance of Bhagavad-gītā, without misinterpretation, on the authority of Krsna. To interpret Bhagavad-gītā without any reference to the will of Krsna is the greatest offense…" from Bhagavad-Gita preface.

Sri Krsna is Bhagavan.
"… Similarly, Bhagavad-gītā should be taken or accepted as it is directed by the speaker himself. The speaker of Bhagavad-gītā is Lord Śrī Krsna. He is mentioned on every page of Bhagavad-gītā as the Supreme Personality of Godhead, Bhagavān. Of course the word "bhagavān" sometimes refers to any powerful person or any powerful demigod, and certainly here Bhagavān designates Lord Śrī Krsna as a great personality, but at the same time we should know that Lord Śrī Krsna is the Supreme Personality of Godhead, as is confirmed by all great ācāryas (spiritual masters) like Śankarācārya, Rāmānujācārya, Madhvācārya, Nimbārka Svāmī, Śrī Caitanya Mahāprabhu and many other authorities of Vedic knowledge in India. The Lord Himself also establishes Himself as the Supreme Personality of Godhead in the Bhagavad-gītā, and He is accepted as such in the Brahma-samhitā and all the Purānas, especially the Śrīmad-Bhāgavatam, known as the Bhāgavata Purāna (Krsnas tu bhagavān svayam). Therefore we should take Bhagavad-gītā as it is directed by the Personality of Godhead Himself…."

Sri Krsna is the Supreme Being.
"… How Arjuna accepted this Bhagavad-gītā should be noted. His manner of acceptance is given in the Tenth Chapter. (12) arjuna uvāca param brahma param dhāma pavitram paramam bhavān purusam śāśvatam divyam ādi-devam ajam vibhum (13) āhus tvām rsayah sarve devarsir nāradas tathā asito devalo vyāsah svayam caiva bravisi me (14) sarvam etad rtam manye yan mām vadasi keśava na hi te bhagavan vyaktim vidur devā na dānavāh "Arjuna said: You are the Supreme Brahman, the ultimate, the supreme abode and purifier, the Absolute Truth and the eternal Divine Person. You are the primal God, transcendental and original, and You are the unborn and all-pervading beauty. All the great sages like Nārada, Asita, Devala, and Vyāsa proclaim this of You, and now You Yourself are declaring it to me. O Krsna, I totally accept as truth all that You have told me. Neither the gods nor demons, O Lord, know Thy personality." (Bg. 10. 12-14).

After hearing Bhagavad-gītā from the Supreme Personality of Godhead, Arjuna accepted Krsna as Param Brahma, the Supreme Brahman. Every living being is Brahman, but the supreme living being, or the Supreme Personality of Godhead, is the Supreme Brahman. Param dhāma means that He is the supreme rest or abode of everything, pavitram means that He is pure, untainted by material contamination, puruṣam means that He is the supreme enjoyer, divyam, transcendental, ādi-devam, the Supreme Personality of Godhead, ajam, the unborn, and vibhum, the greatest, the all-pervading…"

Purpose of Sri Krsna's visit.
"Lord Krsna descends specifically to reestablish the real purpose of life when man forgets that purpose. Even then, out of many, many human beings who awaken, there may be one who actually enters the spirit of understanding his position, and for him this Bhagavad-gītā is spoken. Actually we are all followed by the tiger of nescience, but the Lord is very merciful upon living entities, especially human beings. To this end He spoke the Bhagavad-gītā, making His friend Arjuna His student.." from the unrevised unedited Bhagavad-Gita as it is, Introduction.