John Chrysostom
Since the apostles were grieved and frightened by what had already happened, while they had to go forth to great contests, He encouraged them with words about the future.
"Eating with them, He commanded them not to depart from Jerusalem, but to wait for the promise of the Father, which you have heard from Me."
At first, when they were still afraid and terrified, He led them into Galilee, so that they might hear His words without fear.
Then, when they had heard and had spent forty days with Him, "He commanded them not to depart from Jerusalem." Why was this?
No one allows soldiers who are about to attack the enemy to march out before they are armed. No one lets horses run into the racecourse before they have a charioteer.
Read more (725 words)
So the Lord did not allow them to go out to the struggle before the descent of the Holy Spirit. Otherwise the multitude of enemies might easily overcome and capture them.
He commanded them not to depart from Jerusalem not only for this reason, but also because many there were to believe.
Moreover, lest anyone say that they left their own acquaintances and went boasting among foreigners, they present the proofs of His Resurrection before the very people who killed Christ.
They do this before those very men who crucified and buried Him, in the very city where this lawless deed had been committed with such audacity.
By this the mouths of all foreigners were also stopped. Indeed, if those who crucified Him themselves appear among the believers, this is plainly an evident sign of the Cross.
It is also an evident sign of the lawlessness of the Jews' deed, and a great proof of the Resurrection.
The disciples might have said, "How shall we, being so few and so insignificant, be able to live among such a multitude of impious men breathing murder?"
See how He delivers them from this fear with the words, "but wait for the promise of the Father, which you have heard from Me" (Acts 1:4).
When, you ask, had they heard this? When He said, "It is better for you that I go away; for if I do not go away, the Comforter will not come to you" (Jn 16:7).
And again, "I will pray the Father, and He will give you another Comforter, that He may abide with you forever" (Jn 14:16).
But why did the Holy Spirit not come while Christ was still on earth, nor immediately after His departure?
Christ ascended on the fortieth day, while the Holy Spirit came "when the day of Pentecost had fully come" (Acts 2:1). Why was there this delay?
And how, when the Spirit had not yet come, did Christ say, "Receive the Holy Spirit" (Jn 20:22)?
This was to prepare the disciples and make them capable of receiving Him. For if Daniel grew weak from having to see an angel (Dan 8:17), how much more would they have weakened?
They were to receive such great grace. Either these words must be understood in this sense, or Christ spoke of the future as already accomplished.
In the same way He said, "Tread upon serpents and scorpions, and upon all the power of the enemy" (Lk 10:19).
But why did the Holy Spirit not come immediately then? The apostles had to be kindled with desire for this event, and only then receive grace.
Therefore the Holy Spirit came when Christ had departed. If He had come while Christ was still on earth, there would not have been such expectation in them.
For the same reason He did not come immediately after Christ's Ascension, but eight or nine days later. We too turn to God most earnestly when we are placed in some need.
For this reason John especially sent his disciples to Christ when they were to need Jesus, since he himself was already in prison.
On the other hand, our nature first had to appear in heaven, and reconciliation had to be fully accomplished. Then the Spirit would come, and the disciples would be filled with pure joy.
If Christ had departed after the coming of the Holy Spirit, while the Holy Spirit remained on earth, this would not have been such consolation for them.
They were deeply attached to Christ. Therefore He said to comfort them, "It is better for you that I go away" (Jn 16:7).
For this reason He delays the sending of the Holy Spirit for several days. After tasting a little sorrow and feeling their need, as I have said, they would enjoy full and pure joy.
If the Spirit were less than Him, this consolation would not have been sufficient. How then could He have said, "It is better for you"?
For this reason the greater part of the teaching is entrusted to the Holy Spirit, so that He would not be thought inferior.
Notice into what necessity Christ placed the disciples by promising to give the Spirit in Jerusalem. They had to remain there.
Lest they scatter again after His Ascension, He holds them all there by this expectation, as by certain bonds.