Isaiah 53:5: But he was wounded for our transgressions, he was bruised for our iniquities; upon him was the chastisement that made us whole, and with his stripes we are healed.
Dies Domini - Keeping the Lords Day Holy - Parts 28 - 29 - Pope John Paul II
The day of the gift of the Spirit
28. Sunday, the day of light, could also be called the day of "fire", in reference to the Holy Spirit. The light of Christ is intimately linked to the "fire" of the Spirit, and the two images together reveal the meaning of the Christian Sunday.(33) When he appeared to the Apostles on the evening of Easter, Jesus breathed upon them and said: "Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained" (Jn 20:22-23). The outpouring of the Spirit was the great gift of the Risen Lord to his disciples on Easter Sunday. It was again Sunday when, fifty days after the Resurrection, the Spirit descended in power, as "a mighty wind" and "fire" (Acts 2:2-3), upon the Apostles gathered with Mary. Pentecost is not only the founding event of the Church, but is also the mystery which for ever gives life to the Church.(34) Such an event has its own powerful liturgical moment in the annual celebration which concludes "the great Sunday",(35) but it also remains a part of the deep meaning of every Sunday, because of its intimate bond with the Paschal Mystery. The "weekly Easter" thus becomes, in a sense, the "weekly Pentecost", when Christians relive the Apostles' joyful encounter with the Risen Lord and receive the life-giving breath of his Spirit.
The day of faith
29. Given these different dimensions which set it apart, Sunday appears as the supreme day of faith. It is the day when, by the power of the Holy Spirit, who is the Church's living "memory" (cf. Jn 14:26), the first appearance of the Risen Lord becomes an event renewed in the "today" of each of Christ's disciples. Gathered in his presence in the Sunday assembly, believers sense themselves called like the Apostle Thomas: "Put your finger here, and see my hands. Put out your hand, and place it in my side. Doubt no longer, but believe" (Jn 20:27). Yes, Sunday is the day of faith. This is stressed by the fact that the Sunday Eucharistic liturgy, like the liturgy of other solemnities, includes the Profession of Faith. Recited or sung, the Creed declares the baptismal and Paschal character of Sunday, making it the day on which in a special way the baptized renew their adherence to Christ and his Gospel in a rekindled awareness of their baptismal promises. Listening to the word and receiving the Body of the Lord, the baptized contemplate the Risen Jesus present in the "holy signs" and confess with the Apostle Thomas: "My Lord and my God!" (Jn 20:28).