Last Sunday, we celebrated the sending of the Spirit, which sealed God’s new covenant and made a new creation.

In this new creation, we live in the family of God, who has revealed himself as a Trinity of love. We share in His divine nature through His Body and Blood (see 2 Peter 1:4). This is the meaning of the three feasts that cap the Easter season — Pentecost, Trinity Sunday, and Corpus Christi.

The giving of the Spirit to the new people of God crowns the mighty acts of the Father in salvation history.

The Jewish feast of Pentecost called all devout Jews to Jerusalem to celebrate their birth as God’s chosen people in the covenant Law given to Moses at Sinai (see Leviticus 23:15-21; Deuteronomy 16:9-11).

In today’s First Reading, the mysteries prefigured in that feast are fulfilled in the pouring out of the Spirit on Mary and the Apostles (see Acts 1:14).

Today’s First Reading begins by giving us a time frame—the events take place during the days between Christ’s Ascension and Pentecost. We’re at the same point in our liturgical year. On Thursday we celebrated His being taken up in glory, and next Sunday we will celebrate His sending of the Spirit upon the Church.

Jesus’ prayer in the Gospel today also captures the mood of departure and the anticipation. He is telling us today how it will be when He is no longer in the world.

God is love, and He revealed that love in sending His only Son to be a sacrificial offering for our sins.

In these words from today’s Epistle, we should hear an echo of the story of Abraham’s offering of Isaac at the dawn of salvation history. Because Abraham obeyed God’s command and did not withhold his only beloved son, God promised that Abraham’s descendants, the children of Israel, would be the source of blessing for all nations (see Genesis 22:16-18).