BG 4.3

That very ancient science of the relationship with the Supreme is today told by Me to you because you are My devotee as well as My friend and can therefore understand the transcendental mystery of this science.

4.3. The self-same ancient Yoga has been taught now by Me to you on the ground that you are My devotee and friend too. This is the highest secret.

4.3 It is the same ancient Path that I have now revealed to thee, since thou are My devotee and My friend. It is the supreme Secret.

4.1-3 Evam etc. upto uttamam. Eventhough it has come down by regular succession of teacher, it is lost now. By this [statement] the Bhagavat indicates the rarity (or difficulty) and respectability of this knowledge. You are My devotee and friend too : You are a devotee having nothing but Me as your final goal and you are a friend too. This 'too' indicates the secondary importance [of the friendship]. Hence, just as in the sentence 'wander begging food [etc]', the importance lies in the act of begging food, but unimportance in the act of bringing the cow; in the same way, in the present case it is devotion towards the teacher that is important and not the friendship also. This is the idea intended here.

4.3 It is the same ancient, unchanged Yoga which is now taught to you, who out of friendship and overwhelming devotion have resorted to Me whole-heartedly. The meaning is that it has been taught to you fully with all its accessories. Because it is the most mysterious knowledge declared in the Vedanta, it cannot be known or taught by anyone other than Myself. In this connection, in order to know the truth about the Lord's descent correctly, Arjuna asked:

4.3 Sah, that; puratanah, ancient; yogah, Yoga; eva, itself; ayam, which is this; proktah, has been taught; te, to you; maya, by Me; adya, today; iti, considering that; asi, you are; me, My; bhaktah, devotee; ca sakha, and friend. Hi, for; etat, this Yoga, i.e. Knowledge; is a uttamam, profound; rahasyam, secret. Lest someone should understand that the Lord has said something contradictory, therefore, in order to prevent that (doubt), as though raising a estion,

4.3 It is the same ancient Yoga which is now taught to you by Me, as you are My devotee and My friend. For, this is a supreme mystery.

4.3 That ancient Yoga itself, which is this, has been taught to you by Me today, considering that you are My devotee and friend, For, this (Yoga) is a profound secret.