The undoubted conviction that the Lord is alive and has risen from the dead takes possession of their soul and fills it with joy. "And he saw and believed," John the Theologian says of himself.
Yet he undoubtedly acknowledges the same feeling in Peter. He presents himself only as a witness that, in all the circumstances of this event, one could not fail to come to faith in the Lord's Resurrection. Perhaps he even implies that faith had already flared up earlier in Peter's soul, since Peter entered the tomb before him.
That John is speaking of faith kindled in both hearts is clear from the following verse. There he says of both: "For as yet they did not know the Scripture, that He must rise from the dead."
Having received in their soul the conviction that the Lord is alive, and that what He Himself had told them had been fulfilled, the disciples' thoughts turn to the Law of Moses and the prophetic books. They seek the connection between the words of revelation and the events taking place.
Only then does the meaning of the words of the Psalm begin to become clear to them: Ps 15:10, "You will not leave My soul in Hades, nor will You allow Your Holy One to see corruption."
Only then do they remember many other prophecies. Among them is Isaiah chapter 53, which portrays with such clarity the Lord's sufferings, death, and burial, and ends with a cry of joy and victory.
They also remember the victorious cry of Hosea, Hos 13:14: "O death, where is your sting? O Hades, where is your victory?"
Yet full understanding of the prophecies was given to the Apostles only later. Then the Lord granted them the Holy Spirit and opened their mind to understand the Scriptures: Jn 20:22; Lk 24:45.
Therefore John the Theologian says, conscious of man's powerlessness to understand the Scriptures by himself: "For as yet they did not know the Scripture, that He must rise from the dead."
Only the Lord Himself, after appearing to the disciples, fully disclosed to them the meaning of the whole chain of prophecies. These announced God's providence for the salvation of man on earth.
Therefore, when Peter and John stand in the tomb, their souls are filled with faith and burn with love. Yet they do not yet possess the knowledge that the Lord will give them by the Holy Spirit.
John the Theologian notes this condition of their soul and mind. By this he shows how the Lord gradually enlightened them and opened the eyes of their understanding. Thus He made them worthy preachers of the Gospel and shepherds of Christ's flock.
"Then the disciples went back to their own homes," says John, "marveling at what had happened," as Luke adds in Lk 24:12, speaking of Peter alone.
Meanwhile Mary Magdalene had run after the disciples when they ran to the tomb. But she remained outside the tomb while Peter and John were inside it.
Peter and John certainly go back in order to tell the Theotokos what they had seen and felt. They also wished to gather all the other Apostles together, so that they might wait for the Lord in reverence.
For this reason we see the Apostles and the other believers, Lk 24:33, "and those who were with them," gathered together on the evening of that day.
Meanwhile Mary Magdalene, in deep sorrow, could not tear herself away from the tomb. She stands near the tomb and weeps bitter tears.