Kṛṣṇa emphasizes the rarity of the vision Arjuna just received. He states that neither by the study of the Vedas, nor by performing sacrifices, nor by giving huge charities, nor by severe penances can one see this Universal Form. These material and religious efforts are not enough to ‘buy’ a vision of the Absolute. It is a gift that cannot be forced. This is a humbling statement for those who rely on their own merits. You might be the greatest scholar or the most disciplined ascetic, but Kṛṣṇa remains hidden if He so chooses. The vision is only possible through His mercy. He addresses Arjuna as ‘Kuru-pravīra’ (Hero of the Kurus), acknowledging that Arjuna’s true heroism is his devotion, which qualified him for this grace. It teaches us that spiritual life is not a transaction. We don’t ‘earn’ God through our work. While study and charity are good, they are meant to purify us so that we become eligible for the Lord’s grace. Arjuna’s experience was unique because his relationship with Kṛṣṇa was unique. True vision is a result of love, not just labor.