Gospel commented,« Receive the Holy Spirit » Saint John 20:19-31.

On the evening of that first day of the week, when the doors were locked, where the disciples were, for fear of the Jews, Jesus came and stood in their midst and said to them, «Peace be with you.»
When he had said this, he showed them his hands and his side. The disciples rejoiced when they saw the Lord.
(Jesus) said to them again, "Peace be with you. As the Father has sent me, so I send you."
And when he had said this, he breathed on them and said to them, "Receive the holy Spirit.
Whose sins you forgive are forgiven them, and whose sins you retain are retained."
Thomas, called Didymus, one of the Twelve, was not with them when Jesus came. 
So the other disciples said to him, "We have seen the Lord." But he said to them, "Unless I see the mark of the nails in his hands and put my finger into the nailmarks and put my hand into his side, I will not believe." 
Now a week later his disciples were again inside and Thomas was with them. Jesus came, although the doors were locked, and stood in their midst and said, "Peace be with you." 
Then he said to Thomas, "Put your finger here and see my hands, and bring your hand and put it into my side, and do not be unbelieving, but believe." 
Thomas answered and said to him, "My Lord and my God!"
Jesus said to him, "Have you come to believe because you have seen me? Blessed are those who have not seen and have believed."
Now Jesus did many other signs in the presence of (his) disciples that are not written in this book.
But these are written that you may (come to) believe that Jesus is the Messiah, the Son of God, and that through this belief you may have life in his name.

« Receive the Holy Spirit »

Having been baptized into Christ, and put on Christ (Gal 3,27), you have been made conformable to the Son of God; for God, having predestined us for adoption (Eph 1,5), formed us (Gn 2,7) according to Christ's glorious body... You have become “christs” by receiving the sign of the Holy Spirit. Everything that has happened to you has been in imitation of Christ, whose images you are.

Having washed in the river Jordan… Christ came up from the waters and the Holy Spirit, in the fullness of his being, alighted on him. In the same way you, after you had come up from the baptismal pool, received the unction and were anointed with the holy chrism which is the Holy Spirit with which Christ himself was anointed... For Christ was not anointed with oil or a material ointment, but the Father, who had appointed him beforehand to be Savior of the whole world, anointed him with the Holy Spirit, as David the Prophet also cried, saying: “God, your God, has anointed you with the oil of gladness above your fellows” (Ps 44[45],8).

And as Christ was in reality crucified, and buried, and raised, so you are, in baptism, accounted worthy of sharing symbolically in his cross, his tomb and his resurrection. So it is, too, regarding the unction. Christ was anointed with a spiritual oil of gladness, that is, with the Holy Spirit, who is called oil of gladness because he is the author of spiritual gladness. In the same way you were anointed with a holy oil that made you partakers and fellows of Christ himself…  And you were first anointed on the forehead, that you might be delivered from the shame of the first Adam and that with unveiled face might reflect as in a mirror the glory of the Lord (2Cor 3,16).