One who does not take shelter of the lotus feet of Kṛṣṇa, he may rise up very high by austerity and penance, but he cannot remain in that position. He may give up artificially this material world, jagan mithyā, but he has to come down again to this mithyā jagat and open schools and hospitals, because he cannot remain in that impersonal way.
That is the experience. All so-called brahmavādī, they say that "We have become liberated," but not liberated. That is simply concoction, vimukta-māninaḥ. They think like that. Actually they are not liberated. Aviśuddha-buddhayaḥ. Without being liberated, when one speaks that, "I have become liberated," that means aviśuddha-buddhayaḥ: the intelligence is not clear. He does not know what is liberation. Liberation means prasanna-manasa, full of joyfulness. That is liberation. Evaṁ prasanna-manasaḥ, bhagavat-tattva . . . bhagavat-tattva-vijñānam (SB 1.2.20). Tattva means truth. You have to understand Bhagavān in truth.
So that, to understand in truth, that is a science. That is not sentiment. Vijñāna. In another place Kṛṣṇa says, to advise Brahmā, catuḥ-śloki-bhāgavata (SB 2.9.33/34/35/36), jñānam . . . in the Bhagavad-gītā also, jñānaṁ sa-vijñānam. Jñānaṁ me parama-guhyaṁ yad vijñāna-samanvitam (SB 2.9.31). The jñānaṁ me parama-guhyam, the knowledge of the Supreme Personality of Godhead, is very, very confidential. Jñānaṁ me parama-guhyaṁ yad vijñāna-samanvitam. It is not sentiment. It is full of scientific knowledge.