What Is the Holy Spirit and What Does He Do?

Ask most people what they think of when they hear "the Holy Spirit" and you will get a wide range of answers — a warm feeling during worship, a powerful revival, speaking in tongues, a dove, a flame. These are all drawn from Scripture, but none of them captures who the Holy Spirit actually is. The Spirit is not an experience or a force. He is a person — the third person of the Trinity — and Scripture describes his work in more detail than most Christians realise.

Who Is the Holy Spirit?

The Holy Spirit is fully God — equal in nature, power, and glory to the Father and the Son. He is not a lesser deity, not an energy or essence, not an "it." Jesus uses the masculine personal pronoun for the Spirit throughout John 14–16, calling him the "Paraclete" — a Greek word meaning advocate, counsellor, or helper. The Spirit has a mind (Romans 8:27), a will (1 Corinthians 12:11), and emotions — he can be grieved (Ephesians 4:30). These are not the attributes of a force; they are the attributes of a person.

The Holy Spirit has been present and active from the very beginning — "hovering over the waters" at creation (Genesis 1:2), empowering the judges and kings of Israel, speaking through the prophets (2 Peter 1:21). What changes at Pentecost is not his existence but his mode of presence: from that point, he indwells every believer permanently (John 14:17), not merely resting on select individuals temporarily as in the old covenant.

What Does the Holy Spirit Do?

Scripture describes a remarkable range of the Spirit's work, both in the world and in the individual believer.

Convicts of sin. Jesus said the Spirit "will convict the world of guilt in regard to sin and righteousness and judgment" (John 16:8). The uncomfortable awareness that something is wrong — that you have fallen short, that you need forgiveness — is the Spirit's work.

Regenerates. New birth is not something you produce — it is something the Spirit does. Jesus told Nicodemus: "Flesh gives birth to flesh, but the Spirit gives birth to spirit" (John 3:6). The capacity to respond to God in faith is itself a gift of the Spirit.

Indwells. "Your body is a temple of the Holy Spirit, who is in you" (1 Corinthians 6:19). Every believer — not just leaders or especially spiritual people — is permanently indwelt by God himself. This is one of the staggering realities of the new covenant.

Produces fruit. The transformation of character that marks a genuine Christian — "love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control" (Galatians 5:22–23) — is the fruit of the Spirit, not the product of self-improvement. It grows as a believer remains in Christ.

Gives gifts. The Spirit distributes spiritual gifts for the building up of the church (1 Corinthians 12:4–11) — gifts including teaching, prophecy, healing, administration, encouragement, and others. Christians disagree on which gifts continue today (the cessationist/continuationist debate), but all agree the Spirit equips the body of Christ for ministry.

Intercedes. "The Spirit himself intercedes for us through wordless groans" (Romans 8:26). When prayer feels impossible and words fail, the Spirit himself prays on behalf of the believer before the Father. This is one of the most humbling and comforting truths in Scripture.

Illuminates Scripture. "The Spirit searches all things, even the deep things of God" (1 Corinthians 2:10). Understanding the Bible is not merely an intellectual exercise — the Spirit opens the mind and heart to receive what God has revealed. This is why prayer before reading Scripture is not superstition; it is wisdom.

Seals and guarantees. "You were sealed with the promised Holy Spirit, who is the guarantee of our inheritance" (Ephesians 1:13–14). The Spirit's presence in the life of a believer is the down-payment, the first instalment, of the glory that is to come. His presence is assurance that the promise of God will be kept.

Why Is the Holy Spirit Often Neglected?

Some traditions have over-emphasised the Spirit, reducing Christianity to emotional experience. Others have under-emphasised him, producing a Christianity that is doctrinally correct but spiritually inert. The New Testament knows neither extreme. The Spirit is the one who makes Christian truth alive, Christian community warm, and Christian character genuinely different. A theology that marginalises the Spirit will produce churches that look right on paper and feel hollow in practice.

John Owen, the great Puritan theologian, wrote: "The principal efficient cause of all our spiritual life is the Holy Spirit." Not one of the causes — the principal one. The Christian life is not primarily self-discipline applied to good doctrine. It is the Spirit of God working in and through a person who has been united to Christ.

"But the Advocate, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you." — John 14:26 (NIV)

"And we all, who with unveiled faces contemplate the Lord's glory, are being transformed into his image with ever-increasing glory, which comes from the Lord, who is the Spirit." — 2 Corinthians 3:18 (NIV)