CIC 678 Following in the steps of the prophets and John the Baptist, Jesus announced the judgment of the Last Day in his preaching.1 Then will the conduct of each one and the secrets of hearts be brought to light.2 Then will the culpable unbelief that counted the offer of God’s grace as nothing be condemned.3 Our attitude to our neighbor will disclose acceptance or refusal of grace and divine love.4 On the Last Day Jesus will say: “Truly I say to you, as you did it to one of the least of these my brethren, you did it to me.”5

CIC 715 The prophetic texts that directly concern the sending of the Holy Spirit are oracles by which God speaks to the heart of his people in the language of the promise, with the accents of “love and fidelity.”6 St. Peter will proclaim their fulfillment on the morning of Pentecost.7 According to these promises, at the “end time” the Lord’s Spirit will renew the hearts of men, engraving a new law in them. He will gather and reconcile the scattered and divided peoples; he will transform the first creation, and God will dwell there with men in peace.

CIC 1287 This fullness of the Spirit was not to remain uniquely the Messiah’s, but was to be communicated to the whole messianic people.8 On several occasions Christ promised this outpouring of the Spirit,9 a promise which he fulfilled first on Easter Sunday and then more strikingly at Pentecost.10 Filled with the Holy Spirit the apostles began to proclaim “the mighty works of God,” and Peter declared this outpouring of the Spirit to be the sign of the messianic age.11 Those who believed in the apostolic preaching and were baptized received the gift of the Holy Spirit in their turn.12

1 Cf. Dan 7:10; Joel 3-4; Mal 3: 19; Mt 3:7-12.
2 Cf Mk 12:38-40; Lk 12:1-3; Jn 3:20-21; Rom 2:16; I Cor 4:5.
3 Cf. Mt 11:20-24; 12:41-42.
4 Cf. Mt 5:22; 7:1-5.
5 Mt 25:40.
6 Cf. Ezek 11:19; 36:25-28; 37:1-14; Jer 31:31-34; and cf. Joel 3:1-5.
7 Cf. Acts 2:17-21.
8 Cf. Ezek 36:25-27; Joel 3:1-2.
9 Cf. Lk 12:12; Jn 3:5-8; 7:37-39; 16:7-15; Acts 1:8.
10 Cf. Jn 20:22; Acts 2:1-14.
11 Acts 2:11; Cf. 2:17-18.
12 Cf. Acts 2:38.