So all this to be learned through bhakti-yoga. We cannot learn by speculation. That is not possible. That is jaḍa-vidyā. Jaḍa-vidyā. It is rāja-vidyā. Jaḍa-vidyā will not help you to understand Kṛṣṇa. That will not help. No. Bhaktivinoda Ṭhākura said, jaḍa vidyā sab māyāra vaibhava. By advance of material science you are simply increasing the paraphernalia of this māyā, illusory energy. Jada-vidyā sab māyāra vaibhava, tomāra bhajane bādhā. The more one become materialistic scientist, he, he defies God: "Hah. That is not. We, we believe in science, believe in science." But what is your science perfection? That is a different subject matter. But the difficulty is, at the present moment especially, the more one becomes advanced in this material knowledge, he becomes atheist. He becomes disbeliever.
Therefore Bhaktivinoda Ṭhākura says, jaḍa-vidyā sab māyāra vaibhava, tomāra bhajane bādhā. It is simply hindrances. Anitya saṁsāre moha janamiyā jīva ke karaye gadha. Every word has got meaning. Jīva ke karaye gadha. This gāḍha, Bhaktivinoda Ṭhākura has said . . . it is not Bhaktivinoda Ṭhākura's wordings; it is the Vedic scripture. Kṛṣṇa also says, na māṁ prapadyante mūḍhāḥ duṣkṛtino narādhamāḥ (BG 7.15). Mūḍhāḥ, mūḍhāḥ means gāḍha, "who has no knowledge." So anyone who does not surrender to Kṛṣṇa, what he is? He is in the four classes: na māṁ duṣkṛtino mūḍhāḥ prapadyante narādhamāḥ.
Either he's a narādhama or he's an ass, mūḍhāḥ, or he's full of sinful activities, or if you say that he's so learned scholar, then māyaya apahṛta-jñānā, his knowledge has been taken out by māyā. Otherwise, how he cannot surrender to Kṛṣṇa? How he cannot surrender to Kṛṣṇa? Because he is not surrendering to Kṛṣṇa, he must be classified in either of these categories—mūḍhāḥ, duṣkṛtino, narādhama, māyaya apahṛta-jñānā (BG 7.15).
Therefore we have to take shelter of this rāja-vidyā, not the jaḍa-vidyā. Jaḍa-vidyā will not help. Rāja-vidyā, rāja-guhyam. Very confidential. Very con . . . just like Kṛṣṇa describing in the last, eighteenth chapter, guhyatamam: "My dear Kṛṣṇa (Arjuna), I have given you all kinds of knowledge, but I am giving the most confidential knowledge now." What is that? Sarva-dharmān parityajya mām ekaṁ śaraṇam (BG 18.66). This is the most confidential.