We can challenge these scientists, so-called scientists. Their basic principle of knowledge is on the bodily concept of life, pratyakṣa, experimental knowledge. Experimental knowledge means this gross sense perception. That is experimental. Pratyakṣa. Everyone says: "We do not see God." God is not such a subject matter that you can see with this pratyakṣa, direct perception. God's another name is Anubhāva. Anubhāva. Just like in this room we do not see the sun directly, but we know that there is sun. It is daytime. How do you know it? You do not see. But there are other processes by which you can experience. That is called aparokṣa. Pratyakṣa, parokṣa, aparokṣa.
In this way, Kṛṣṇa consciousness means adhokṣaja and aprakṛta: beyond the senses. Therefore, in the Bhagavad-gītā it is said adhokṣaja: where direct perception cannot reach. So where direct perception cannot reach, then how you can perceive anubhāva? That is śrota-panthā. That is śruti. You have to take knowledge from the Vedas. And the Vedic knowledge is explained by guru. Therefore one has to take shelter of Kṛṣṇa as the Supreme guru or His representative. Then all these troubles, means ignorance, can be dissipated. Yac chokam ucchoṣaṇam indriyāṇām (BG 2.8).