Here are some of my inchoate thoughts on Pentecost. Obviously they shouldn’t be taken as authoritative by anyone.
For a very long time I wondered why Jesus had to ascend into Heaven in order to send the Holy Spirit. Why couldn’t He have stayed on earth with His apostles? It would’ve made it a lot easier for the Church. If anyone tried to persecute Christians, Jesus could’ve come up and showed His wounds and said “Here, see? I’m alive!”
Yes, if Jesus stayed with us we could’ve achieved worldly glory. But we wouldn’t have had the Holy Spirit, because according to the Gospel today, Jesus had “not yet been glorified.” Our Lord was glorified through His Cross and Resurrection, yes, but this glorification was not complete until He ascended to the Father. Through His resurrection, death was defeated and human nature was restored to its original state, but it was not enough. Human nature had to be glorified, it had to be deified. And thus through Christ’s Ascension human nature becomes deified, at least potentially so, allowing for us to receive the Holy Spirit. As someone raised with a Western mindset, focusing on Christ’s crucifixion and resurrection, Pentecost made no sense. But now, as an Orthodox, it makes complete sense to me. Hopefully I will go beyond mere words, and be made worthy of the deifying power of the Holy Spirit.