19th December: O Root of Jesse
O Root of Jesse, standing as a sign among the peoples;
before you kings will shut their mouths,
to you the nations will make their prayer:
Come and deliver us, and delay no longer.

The Symbol is that of the shoot flowering... signalling the hope that the Lord offers in times when everything seems dark and dead.
The prayer too is to reinforce that hope...that we may always look forward to the deliverance that the Lord can offer! Note that the readings of the liturgy too relate to the same sense of hope in the Lord who accomplishes marvels for us!