The word avitatha-gīrbhiḥ means “they whose spoken vibrations cannot be nullified.” The brāhmaṇas (dvija, the twice-born), are given a chance by the śāstric regulations to become almost as powerful as the Supreme Lord. Whatever a brāhmaṇa speaks cannot be nullified or changed in any circumstance. According to the Vedic injunctions, a brāhmaṇa is the mouth of the Supreme Personality of Godhead; therefore in all rituals a brāhmaṇa is offered food (brāhmaṇa-bhojana) because when a brāhmaṇa eats, it is considered that the Supreme Lord Himself eats. Similarly, whatever a brāhmaṇa speaks cannot be changed. It must act. The learned sages who were priests at Mahārāja Nābhi’s sacrifice were not only brāhmaṇas but were so qualified that they were like devas, demigods, or God Himself. If this were not the case, how could they invite Lord Viṣṇu to come to the sacrificial arena? God is one, and God does not belong to this or that religion. In Kali-yuga, different religious sects consider their God to be different from the God of others, but that is not possible. God is one, and He is appreciated according to different angles of vision. In this verse the word kaivalyāt means that God has no competitor. There is only one God. In the Śvetāśvatara Upaniṣad (6.8) it is said, na tat-samaś cābhyadhikaś ca dṛśyate: “No one is found to be equal to Him or greater than Him.” That is the definition of God.