Of course, Lord Caitanya has made it so easy for this age that if you sincerely, with devotion, chant Hare Kṛṣṇa, you'll be able to understand. But the science as it is, itself, it is very difficult. It is very difficult. But because the age is not very favorable, the time is not very favorable, therefore Lord Caitanya has inaugurated this saṅkīrtana movement by chanting Hare Kṛṣṇa and dancing, so that your mind very quickly becomes cleared so that you can understand what is Kṛṣṇa consciousness. This simple process.
Otherwise, Kṛṣṇa says it is not for all. "I am speaking to you this scientific knowledge of Kṛṣṇa consciousness unto you." Why "unto you"? Because he's a surrendered soul. He's a surrendered soul. The beginning of Bhagavad-gītā is there. You know. When Kṛṣṇa was talking with Arjuna as friend, He did not talk very seriously. He was simply saying: "My dear Arjuna, it is not good for you that you shall not fight. You are a kṣatriya, you belong to the warrior class, so if you don't fight, it will not be very good." In this way, on the basis of friendship.
But Arjuna also understood that, "Kṛṣṇa is not very seriously talking with me, because we are friends." So he surrendered himself. He said that, "My dear Kṛṣṇa, I can understand that the problem which has arisen in this battlefield, it is very difficult problem. I have come here to fight, but I have been disturbed with sentiment. So how I can kill my brothers, my teacher, my grandfather, my grandsons, and so on, so on? So, but I know also that these problems, this problematic situation which has arisen, it can be solved by You only."
But Arjuna knew it that "Kṛṣṇa is not my ordinary friend. He is the Supreme Personality of Godhead." Therefore he at once surrendered. Śiṣyas te 'haṁ śādhi māṁ prapannam (BG 2.7): "I am surrendered unto You as Your disciple. Please accept me and just teach me what is good for me." Therefore Kṛṣṇa also says that jṣānaṁ te aham, "I am speaking to you this knowledge, this confidential knowledge, because you are surrendered."
So this thing, this Kṛṣṇa consciousness, begins. Unless you have got at least a little attachment for Kṛṣṇa, unless you have taken to any sort of service to Kṛṣṇa, it is very difficult to understand. Jṣānaṁ te 'haṁ sa-vijṣānam (BG 7.2). Tac-chakti-dvaya-vivikta-svarūpa-viṣayakam. So jṣānam, you can understand this because you are surrendered soul. Prapannāyāśeṣataḥ samagrena upadekṣyāmi. So jṣānam means the actual, factual knowledge. Jṣānam means factual knowledge and practical demonstration of that knowledge. That will be explained in this chapter, and we shall further discuss on this point.