The Holy Spirit is the Spirit of God in official manifestation. This is a mode of description almost peculiar to the New Testament. The Holy Spirit is the same Spirit mentioned in the testimonies quoted from the Old Testament, but styled Holy Spirit by way of distinction from the Spirit in it's free, spontaneous, universal form in nature. It is the same Spirit, gathered up, as it were, under the focalizing power of the divine will, for the bestowal of divine gifts and the accomplishment of divine results.

The angel answered and said unto her, The Holy Spirit shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God. (Luke 1:35).

How God anointed Jesus of Nazareth with the Holy Spirit and with power: who went about doing good, and healing all that were oppressed of the devil; for God was with him. (Acts 10:38).

The Comforter, which is the Holy Spirit, whom the Father will send in my name, he shall teach you all things 1 and bring all things to your remembrance, whatsoever I have said unto you. (John 14:26).

He shall baptize you with the Holy Spirit, and with fire: (Matthew 3:11).

John truly baptized with water; but ye shall be baptized with the Holy Spirit not many days hence... ye shall receive power, after that the Holy Spirit is come upon you (Acts 1:5-8).

Suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting and they were all filled with the Holy Spirit, and began to speak with other tongues, as the Spirit gave them utterance. (Acts 2:2-4).

And as I began to speak, the Holy Spirit fell on them, as on us at the beginning. Then remembered I the word of the Lord, how that he said, John indeed baptized with water; but ye shall be baptized with the Holy Spirit. (Acts 11:15,16).

Then laid they their hands on them, and they received the Holy Spirit. And when Simon saw that through laying on of the apostles' hands the Holy Ghost was given, he offered them money, Saying, Give me also this power (Acts 8:17-19).

The foregoing testimonies make plain the New Testament meaning of being baptized with the Holy Spirit, which is a very different meaning from that attached to it by professors of popular theology. It means an immersion or enswathement in spirit power, conferring miraculous gifts. No baptism of the Holy Spirit now takes place. All that can now be done is to preach the Word, and this having been given through the agency of the Spirit, working in ancient prophets and apostles, is the Spirit's instrument - the Spirit's word, by which the Spirit makes war on the natural mind, and hews it into the similitude of the mind of the Spirit.

1 Here the Spirit is personified, and some people deduce from this the personality of the Holy Spirit as distinct from the Father, whose messenger the Spirit is here represented to be. Such forget that it was the custom of Jesus to personify great principles, such as Manna - a master, Sin - a master; also the Prince of this world. Wisdom is spoken of in Proverbs as a woman (Proverbs 8:12) - the Spirit here as a man, but the literal fact in both cases excludes the idea of personality.