3 To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:
After that, Pentecost is a most joyous space for conferring baptisms; wherein, too, the resurrection of the Lord was repeatedly proved among the disciples, and the hope of the advent of the Lord indirectly pointed to, in that, at that time, when He had been received back into the heavens, the angels told the apostles that "He would so come, as He had withal ascended into the heavens; " at Pentecost, of course.
The Passover affords a more than usually solemn day for baptism; when, withal, the Lord's passion, in which we are baptized, was completed. Nor will it be incongruous to interpret figuratively the fact that, when the Lord was about to celebrate the last Passover, He said to the disciples who were sent to make preparation, "You will meet a man bearing water." He points out the place for celebrating the Passover by the sign of water. After that, Pentecost is a most joyous space for conferring baptisms; wherein, too, the resurrection of the Lord was repeatedly proved among the disciples [Acts 1:3], and the hope of the advent of the Lord indirectly pointed to, in that, at that time, when He had been received back into the heavens [Acts 1:9], the angels told the apostles that "He would so come, as He had withal ascended into the heavens;" [Acts 1:11] at Pentecost, of course. But, moreover, when Jeremiah says, "And I will gather them together from the extremities of the land in the feast-day," he signifies the day of the Passover and of Pentecost, which is properly a "feast-day." However, every day is the Lord's; every hour, every time, is apt for baptism: if there is a difference in the solemnity, distinction there is none in the grace.
After these points, Celsus proceeds to bring against the Gospel narrative a charge which is not to be lightly passed over, saying that "if Jesus desired to show that his power was really divine, he ought to have appeared to those who had ill-treated him, and to him who had condemned him, and to all men universally." For it appears to us also to be true, according to the Gospel account, that He was not seen after His resurrection in the same manner as He used formerly to show Himself — publicly, and to all men. But it is recorded in the Acts, that "being seen during forty days," He expounded to His disciples "the things pertaining to the kingdom of God." [Acts 1:3] And in the Gospels it is not stated that He was always with them; but that on one occasion He appeared in their midst, after eight days, when the doors were shut [John 20:26], and on another in some similar fashion. And Paul also, in the concluding portions of the first Epistle to the Corinthians, in reference to His not having publicly appeared as He did in the period before He suffered, writes as follows: "For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the Scriptures; and that He was seen of Cephas, then of the twelve: after that He was seen of above five hundred brethren at once, of whom the greater part remain unto the present time, but some are fallen asleep. After that He was seen of James, then of all the apostles. And last of all He was seen of me also, as of one born out of due time." [1 Corinthians 15:3-8] I am of opinion now that the statements in this passage contain some great and wonderful mysteries, which are beyond the grasp not merely of the great multitude of ordinary believers, but even of those who are far advanced (in Christian knowledge), and that in them the reason would be explained why He did not show Himself, after His resurrection from the dead, in the same manner as before that event.
"To whom also He shewed Himself alive." Having first spoken of the Ascension, he adverts to the Resurrection; for since thou hast been told that "He was taken up," therefore, lest thou shouldest suppose Him to have been taken up by others, he adds, "To whom He shewed Himself alive." For if He shewed Himself in the greater, surely He did in the minor circumstance. Seest thou, how casually and unperceived he drops by the way the seeds of these great doctrines?
"Being seen of them during forty days." He was not always with them now, as He was before the Resurrection. For the writer does not say "forty days," but, "during forty days." He came, and again disappeared; by this leading them on to higher conceptions, and no longer permitting them to stand affected towards Him in the same way as before, but taking effectual measures to secure both these objects, that the fact of His Resurrection should be believed, and that He Himself should be ever after apprehended to be greater than man. At the same time, these were two opposite things; for in order to the belief in His Resurrection, much was to be done of a human character, and for the other object, just the reverse. Nevertheless, both results have been effected, each when the fitting time arrived.
But why did He appear not to all, but to the Apostles only? Because to the many it would have seemed a mere apparition, inasmuch as they understood not the secret of the mystery. For if the disciples themselves were at first incredulous and were troubled, and needed the evidence of actual touch with the hand, and of His eating with them, how would it have fared in all likelihood with the multitude? For this reason therefore by the miracles wrought by the Apostles He renders the evidence of His Resurrection unequivocal, so that not only the men of those times - this is what would come of the ocular proof - but also all men thereafter, should be certain of the fact, that He was risen.
For this He then remained forty days on earth, furnishing in this length of time the sure evidence of their seeing Him in His own proper Person, that they might not suppose that what they saw was a phantom. And not content with this, He added also the evidence of eating with them at their board: as to signify this, the writer adds, "And being at table with them, He commanded." And this circumstance the Apostles themselves always put forth as an infallible token of the Resurrection; as where they say, "Who did eat and drink with Him."
And what did He, when appearing unto them those forty days? Why, He conversed with them, says the writer, "concerning the kingdom of God." For, since the disciples both had been distressed and troubled at the things which already had taken place, and were about to go forth to encounter great difficulties, He recovered them by His discourses concerning the future.
Now, by manifest miracles during forty days in their sight, the Lord confirmed the faith of those whom he bade to be his witnesses to the ends of the earth in its wide boundary. The wonders of creation could not conceal God. What proof [of his real humanity] could the Risen One give so surely as the fact of eating? Human bodies show that they live by this means. About to go to heaven, he went forth to walk round the grove of olive because by its sacred bud it is a place of light and peace. He wished to return [to heaven] from that place, from which the divine fragrance makes agreeable a gleaming person with signed forehead. Since chrism, from the name of Christ, cleanses inwardly those anointed from above, he who will return as victor was raised to the starry firmament and had with him what he had taken on.
Appearing to them during forty days and speaking of the kingdom of God, and eating with them, etc. To strengthen the faith in his resurrection, the Lord often appeared alive to the apostles after his passion, took food, and displayed the same flesh which he had raised from the dead to be touched. But in a higher mystery, by this forty-day conversation with the disciples, he signifies that he would fulfill in secret presence what he had promised. Behold I am with you all days until the end of the world (Matthew 28). For this number designates this temporal and earthly life either because of the four seasons of the year or because of the four winds of heaven. For after we have been buried with Christ through baptism into death, as if having crossed the path of the Red Sea, we have need of the Lord's guidance in this wilderness, who will lead us to heavenly things, and rewarding us with the denarius of his image, will bless us with the presence of the Holy Spirit as with the true rest of jubilee.
He did not appear continuously but in intervals, so that they should long more for His presence, and that He might prepare them for His withdrawl in bodily presence from the world.
That Christ did not stay continually with the disciples was not because He deemed it more expedient for Him to be elsewhere: but because He judged it to be more suitable for the apostles' instruction that He should not abide continually with them.
[AD 220] Tertullian on Acts 1:3