Now his conclusion is that Kṛṣṇa is immoral. That means he could not understand Bhagavad-gītā. Bhagavad-gītā cannot be understood by any demon or third-class man. That is explained in the Bhagavad-gītā. Kṛṣṇa said to Arjuna that: "I am speaking to you the same Bhagavad-gītā (BG 4.1), science of God, which I spoke millions of years ago to the sun-god, because the paramparā is lost and I have picked up you because bhakto 'si me priyo 'si (BG 4.3), you are very dear friend and bhakta."
So Bhagavad-gītā is not meant for the demons or the abhaktas. The first condition is that he must be a devotee of Kṛṣṇa. Then it will be revealed. Otherwise it is not possible. Nāhaṁ prakāśaḥ sarvasya yoga-māyā-samāvṛitaḥ (BG 7.25). Na māṁ duṣkṛtino mūḍhā prapadyante narādhamāḥ (BG 7.15). These things are there. So if one is devotee of Kṛṣṇa, he can understand Bhagavad-gītā very easily. Just like Arjuna understood within half an hour. Others, they cannot understand. In one sense, the people at that time were so educated, advanced, that they could talk about the Absolute Truth and understand within half an hour, one hour. There was no need of books in those days. People were so sharp memoried. Once heard from the spiritual master they'll never forget. With the advancement of Kali, so many things will reduce. One of them is the memory will be reduced. People will be weaker.