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Rāja-vidyā: The King of Knowledge
speech is proof that there is a Supreme Power who is giving us everything. A Kṛṣṇa conscious person knows that whatever he has is not under his control. If we do not believe in God, we must believe in some power beyond us which is controlling us at every step, call that power God or nature or whatever. There is a controlling power in the universe, and no sane man can deny it.
Kṛṣṇa was present on this earth and appeared just like a human being with supernatural power. At that time, however, ninety-nine percent of the people could not recognize Him as God. They could not recognize Him because they had no eyes to see ( param bhāvam ajānantaḥ ). How is it possible to recognize God? He can be recognized through supernatural power, by the evidence of authorities, and by scriptural evidence. As far as Kṛṣṇa is concerned, every Vedic authority has accepted Him as God. When He was present on earth, His activities displayed were superhuman. If one does not believe this, it is to be concluded that he will not believe whatever evidence is given.
One must also have the eyes to see God. God cannot be seen by material senses, therefore the  bhakti-yoga  process is the process of purifying the senses so that we will be able to understand what and who God is. We have power of seeing, hearing, touching, tasting and so on, but if these senses are blunt, we cannot understand God. The process of Kṛṣṇa consciousness is the process of training these senses through regulated principles, specifically through the chanting of Hare Kṛṣṇa.