We are so-called materially suffering and enjoying according to this body. Therefore this body, this human form of body, is a great opportunity, because God realization begins by engaging the tongue. Sevonmukhe hi jihvādau (Brs. 1.2.234). By engaging the tongue in the loving service of the Lord, one can make advance in Kṛṣṇa consciousness, ultimate realization of God, the tongue. So this tongue in the human body can be engaged. In other body, in the cat's body, dog's body, tiger's body . . . tiger may be a very powerful animal. No animal is powerful or better than human beings. That is accepted.
So this human form of life is a great boon to the living entity who is traveling through the cycle of birth and death, perpetually changing different sorts of body. Here is the opportunity, human form of body. We can utilize the tongue properly and get out of these clutches. Sevonmukhe hi jihvādau. So sevā, sevā means service—jihvā ādau, beginning from the tongue.
So if we can keep our tongue engaged, always chanting Hare Kṛṣṇa mantra . . . because "Kṛṣṇa," this sound, is not different from Kṛṣṇa. Kṛṣṇa is absolute. Nothing is different from Him. Kṛṣṇa and Kṛṣṇa's name is not different. In the material sense, everything is different. I myself is different from this body. I am not this body. But Kṛṣṇa is not like that. Kṛṣṇa and Kṛṣṇa's body is the same.