Pentecost: And I believe in the Holy Ghost

The Holy Ghost, then, always existed, and exists, and always will exist. He neither had a beginning, nor will He have an end; but He was everlastingly ranged with and numbered with the Father and the Son. For it was not ever fitting that either the Son should be wanting to the Father, or the Spirit to the Son. For then Deity would be shorn of Its Glory in its greatest respect, for It would seem to have arrived at the consummation of perfection as if by an afterthought. Therefore He was ever being partaken, but not partaking; perfecting, not being perfected; sanctifying, not being sanctified; deifying, not being deified; Himself ever the same with Himself, and with Those with Whom He is ranged; invisible, eternal, incomprehensible, unchangeable, without quality, without quantity, without form, impalpable, self-moving, eternally moving, with free-will, self-powerful, All-powerful (even though all that is of the Spirit is referable to the First Cause, just as is all that is of the Only-begotten); Life and Lifegiver; Light and Lightgiver; absolute Good, and Spring of Goodness; the Right, the Princely Spirit; the Lord, the Sender, the Separator; Builder of His own Temple; leading, working as He wills; distributing His own Gifts; the Spirit of Adoption, of Truth, of Wisdom, of Understanding, of Knowledge, of Godliness, of Counsel, of Fear (which are ascribed to Him) by Whom the Father is known and the Son is glorified; and by Whom alone He is known; one class, one service, worship, power, perfection, sanctification. Why make a long discourse of it? All that the Father hath the Son hath also, except the being Unbegotten; and all that the Son hath the Spirit hath also, except the Generation. And these two matters do not divide the Substance, as I understand it, but rather are divisions within the Substance.
-Gregory of Nazianzus, On Pentecost (Oration XLI)

Come Holy Spirit

Holy Spirit, powerful Consoler, sacred Bond of the Father and the Son, Hope of the afflicted, descend into my heart and establish in it your loving dominion. Enkindle in my tepid soul the fire of your Love so that I may be wholly subject to you. We believe that when you dwell in us, you also prepare a dwelling for the Father and the Son. Deign, therefore, to come to me, Consoler of abandoned souls, and Protector of the needy. Help the afflicted, strengthen the weak, and support the wavering. Come and purify me. Let no evil desire take possession of me. You love the humble and resist the proud. Come to me, glory of the living, and hope of the dying. Lead me by your grace that I may always be pleasing to you.

-St. Augustine

Pentecost: Martyn Lloyd-Jones on Holy Spirit Baptism

What is the baptism of the Holy Spirit? Now there are some, as we have seen, who say that there is really no difficulty about this at all. They say it is simply a reference to regeneration and nothing else. It is what happens to people when they are regenerated and incorporated into Christ, as Paul teaches in 1st Corinthians 12:13: 'By one Spirit are we all baptized into one body' . . . Therefore, they say, this baptism of the Holy Spirit is simply regeneration.

But for myself, I simply cannot accept that explanation, and this is where we come directly to grips with the difficulty. I cannot accept that because if I were to believe that, I should have to believe that the disciples and the apostles were not regenerate until the Day of Pentecost---a supposition which seems to me to be quite untenable. In the same way, of course, you would have to say that not a single Old Testament saint had eternal life or was a child of God. . . .

. . . A definition, therefore, which I would put to your consideration is something like this: the baptism of the Holy Spirit is the initial experience of glory and the reality and the love of the Father and of the Son. Yes, you may have many further experiences of that, but the first experience, I would suggest, is the baptism of the Holy Spirit. The saintly John Fletcher of Madeley put it like this: 'Every Christian should have his Pentecost.'

'This is life eternal,' our Lord prayed, 'that they might know thee the only true God, and Jesus Christ, whom thou has sent' (John 17:3). And it is only the Spirit who can enable us to know that. The baptism of the Holy Spirit, then is the difference between believing these things, accepting the teaching, exercising faith----- that is something that we all know, and without the Holy Spirit we cannot even do that, as we have seen-----and having a consciousness and experience of these truths in a striking and signal manner. The first experience of that, I am suggesting, is the baptism of the Holy Spirit, or the Holy Spirit falling on you, or receiving the Spirit. It is this remarkable and unusual experience which is described so frequently in the book of Acts and which, as we see clearly from the epistles, must have been the possession of the members of the early Christian Church.

-Martin Lloyd Jones, Great Doctrines of the Bible

H/T: Adrian Warnock

Pentecost

But Oh, this power could not be bought. All the money in the world could not have purchased it, but to those who humble themselves in lowliness and in sincerity before the Lord shall the Spirit be given freely without money and without price. Oh, tell me, Peter and Paul, tell me John and James, and all you who received this mighty incoming of the Holy Ghost with its attendant power and glory, may we, in this 20th century, receive this like precious gift, or did the Holy Spirit empty Himself of all His power in the apostolic days? Did you consume all of these supernatural wondrous blessings, or did you leave enough to spare for us today?

"Yes, indeed," they answer in unison. "Heaven is not bankrupt. Heaven's storehouse still is full. The Holy Spirit has never lost his power, the promise is unto them that are afar off, even as many as the Lord our God shall call. Did not our Lord say: 'When He is come, He shall abide with you forever'? Doubt no longer, but with open heart ask ye of the Lord rain in the time of the latter rain. Remember these words of Joel the prophet: 'It shall come to pass in the last days,' saith God, 'I will pour out My Spirit upon all flesh.' Remember, too, that when the high priest went in the Holy of Holies the bells rang, and the high priest came out the bells rang again. When Jesus ascended up on high the bells rang and the people spoke with tongues and magnified God. Now this same Jesus, our high priest, is coming forth again for his waiting church, and on earth the bells are ringing, the latter rain is falling, and again those who have received the old-time power speak with other tongues."

- Aimee Semple McPherson