He who knows what is the support of that Saman, he is supported. Now verily its support is speech only. For, as supported in speech, that breath is sung as that Saman. Some say the support is in food. Next follows the Abhyaroha (the ascension) of the Pavamana verses. Verily the Prastotri begins to sing the Saman, and when he begins, then let him (the sacrificer) recite these (three Yagus-verses): 'Lead me from the unreal to the real! Lead me from darkness to light! Lead me from death to immortality!' Now when he says, 'Lead me from the unreal to the real,' the unreal is verily death, the real immortality. He therefore says, 'Lead me from death to immortality, make me immortal.' When he says, 'Lead me from darkness to light,' darkness is verily death, light immortality. He therefore says, 'Lead me from death to immortality, make me immortal.' When he says, 'Lead me from death to immortality,' there is nothing there, as it were, hidden (obscure, requiring explanation).

In plain words: The chant rests on speech, because breath is sung through speech. When the singing starts, the worshipper should pray: "Lead me from the unreal to the real, from darkness to light, from death to immortality." Both "unreal" and "darkness" mean death, so all three lines ask the same thing: "Make me immortal."