The famous opening ‘Hwaet’ of Beowulf and the ‘Obsculta’ of the Rule of St Benedict have much in common, if Dr George Walkden is to be believed (see http://ind.pn/18jQ2AE). Both were drawing attention to what they had to say, but not in an aggressive ‘Oi, you’ fashion, but rather in a dignified, measured manner, equally suited to poetry and religion. I think Isaiah is doing something of the same in the lyrical passage we read today (Isaiah 40.1-11).
When we are most deeply moved, we don’t use exclamation marks (known to printers as ‘shrieks’, with good reason). We are quieter, more thoughtful, often overwhelmed by the import of what we are thinking or feeling. The voice crying in the wilderness is simultaneously the voice of God and the voice of his disciple, the prophet. It is John the Baptist preparing us for the coming of the Word; and when the Word has been spoken, there is no need of further speech.
This would be a good day to read quietly through those lines of Isaiah and allow them to sink into us. In silence we await the Word.