Gargya said: 'The person that is in space, that I adore as Brahman.' Agatasatru said to him: 'No, no! Do not speak to me on this. I adore him verily as the second who never leaves us.' Whoso adores him thus, becomes possessed of a second, his party is not cut off from him.

In plain words: Gargya says he worships the person in space as Brahman. Agatasatru says he already honors that as "the companion who never leaves us." Whoever honors it this way always has a companion, and his group of friends and followers is never cut off from him.