"O Root of Jesse": the characteristics of the Messiah in the "Book of Emmanuel"

"O Root of Jesse, * which standest for an ensign of the people, at whom the kings shall shut their mouths, to whom the Gentiles shall seek; come to deliver us, make no tarrying!

O radix Iesse * qui stas in signum populórum, super quem continebunt reges os suum, quem Gentes deprecabúntur: veni ad liberándum nos, iam noli tardare."
 
- Magnificat Antiphon, Vespers, December 19

The characteristics of the awaited Messiah begin to appear in the "Book of Emmanuel" ("Isaiah said this when he saw his glory," speaking of Christ), especially in the first two verses of Isaiah 11:

There shall come forth a shoot from the stump of Jesse,
and a branch shall grow out of his roots.
And the Spirit of the LORD shall rest upon him,
the spirit of wisdom and understanding,
the spirit of counsel and might,
the spirit of knowledge and the fear of the LORD.

- CCC 712