Next follows the Yagus. Verily, breath is Yagus, for all these beings are joined in breath. For him who knows this, all beings are joined to procure his excellence; he obtains union and oneness with the Yagus.

In plain words: Breath is the Yajus, the ritual verses, because all beings are joined together through breath. For one who knows this, all beings join to help him do well, and he becomes one with the Yajus.