For whom was the Geetha delivered?

Just think of this for a moment. Milk is not drawn from the cow’s udder for its own sake, for cows do not drink their own milk; Arjuna, the calf, has had his fill and Krishna needs nothing! The Lord Himself clarifies: He milked the Upanishads and brought out the Geetha for the "Sudhee-jana", those who possess intelligence (Su-dhee) that is moderated by goodness and controlled by virtue. 

 But when does one become worthy of receiving the lessons of the Geetha? Rather than exult over your excellence, search for your own faults with the desire of removing them. You will then progress fast without being dragged behind by fear or anxiety. When you move on thus, placing all your burdens on the Lord and with faith in him, you will reach a state of mental calm, which is the sign o f a true aspirant. Arjuna arrived at this stage and then Krishna gave him the teaching that confers immortality.