It does not mean that we are requesting you to chant the name of Kṛṣṇa. We believe that Kṛṣṇa is the name of God, but if you have got another name . . . God has many names. God is unlimited, therefore He has got unlimited names. So if you chant that holy name of God, it doesn't matter, if it actually meaning . . . just like "water." Water, if somebody says jala, he means water. If somebody says "water," he means water. If somebody says pāni, he means water. So actually, if the word you use as the name of God, if it's actually real name of God, then by chanting that holy name, you realize God.
Therefore tongue is the beginning of realization. Sevonmukhe hi jihvādau (Brs. 1.2.234). As well as controlling the tongue, we have to spiritualize the tongue. If you keep the tongue materialized, then it is defective. So two things are done by the tongue: tasting foodstuff and chanting the glories of the Lord. If we engage our tongue in this way . . . foodstuff means . . . our process is to offer foodstuff to the Lord, and the remnants of foodstuff we eat, prasādam. So this is one process, this is one business of the tongue. And another business of the tongue is to chant the holy name of the Lord. So in this way, if you engage your tongue in the service of the Lord, then gradually your realize. You cannot realize, but God reveals Himself, what He is.
So Vedic knowledge means to realize God. That is ultimate aim of Vedic knowledge. And here, Bhagavad-gītā, He's revealing Himself to Arjuna, because he is a devotee. So if we take the words of Arjuna, then we also realize God. This is the process.