CCC 711 “Behold, I am doing a new thing.”¹ Two prophetic lines were to develop, one leading to the expectation of the Messiah, the other pointing to the announcement of a new Spirit. They converge in the small Remnant, the people of the poor, who await in hope the “consolation of Israel” and “the redemption of Jerusalem.”²
We have seen earlier how Jesus fulfills the prophecies concerning himself. We limit ourselves here to those in which the relationship of the Messiah and his Spirit appears more clearly.

CCC 716 The People of the “poor”³ – those who, humble and meek, rely solely on their God’s mysterious plans, who await the justice, not of men but of the Messiah – are in the end the great achievement of the Holy Spirit’s hidden mission during the time of the promises that prepare for Christ’s coming. It is this quality of heart, purified and enlightened by the Spirit, which is expressed in the Psalms. In these poor, the Spirit is making ready “a people prepared for the Lord.”⁴

1 Isa 43:19.
2 Cf. Zeph 2:3; Lk 2:25, 38.
3 Cf. Zeph 2:3; Pss 22:27; 34:3; Isa 49:13; 61:1; etc.
4 Lk 1:17.