How does the Spirit work through preaching to convert sinners?

Question 4188.

Anyone who has preached for long comes to feel the weight of this question, because the work of the Spirit in preaching is the difference between words that only inform and words that actually save. I can prepare a sermon, choose my texts, order my arguments, and deliver them as clearly as I am able, and still nothing eternal will happen unless God the Holy Spirit takes those words and drives them home. That is at once the most humbling and the most freeing truth a preacher ever learns. The converting power was never in my eloquence, and it was never meant to be. It is in the Spirit, working through the Word, and understanding that changes everything about how we preach and how we listen.

Preaching alone cannot raise the dead

We must start with an honest assessment of what the human side of preaching can and cannot do. By itself, the most powerful sermon ever preached cannot give life to a spiritually dead heart. Paul is blunt about it: the natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned (1 Corinthians 2:14). No human argument can break through that. This is why Paul deliberately refused to rely on lofty speech or worldly wisdom, so that the faith of his hearers might not rest in the wisdom of men but in the power of God (1 Corinthians 2:4-5). The Spirit in preaching is not an optional extra that makes a good sermon better; He is the only reason any sermon ever saves a soul.

This protects us from two errors at once. It guards us against trusting in cleverness, technique, or persuasion as though souls were won by skill, and it guards us against despair when we feel our own inadequacy in the pulpit. The decisive factor was never the preacher’s gifts. A stammering man with the Spirit will see more fruit than a brilliant orator without Him. The Spirit in preaching is the great leveller, taking weak instruments and accomplishing through them what no human power could.

How the Spirit in preaching opens a closed heart

So how does He actually work? Jesus said the Spirit would convict the world concerning sin and righteousness and judgement (John 16:8). As the Word is preached, the Spirit presses it into the conscience, stripping away excuses and making a person feel the truth of what they are hearing about their own sin and their need of a Saviour. We see it happen in Acts 2, where Peter preaches and the hearers are cut to the heart and cry out, what shall we do (Acts 2:37). That cutting was not Peter’s rhetoric; it was the Spirit using Peter’s words. The same thing happened with Lydia, of whom Luke says the Lord opened her heart to pay attention to what was said by Paul (Acts 16:14). The Spirit in preaching opens the heart that the preacher can only address from the outside.

Notice the order, because it matters and it is often muddled. The Spirit convicts and illumines, granting the sinner a true sight of his guilt and of the gospel, and the sinner, so awakened, believes; and the one who believes is then born again and made a new creation. The Spirit’s converting work through preaching brings a person to genuine faith rather than bypassing their will. We open this up further in our article on whether the Spirit’s conviction gives a person genuine ability to respond to the gospel, and on the Spirit’s role in conviction of sin.

The Word is the instrument the Spirit uses

The Spirit and the Word belong together, and He has bound His converting work to the preaching of the message about Jesus. Faith comes from hearing, and hearing through the word of Christ (Romans 10:17). So you have been born again, Peter writes, through the living and abiding word of God, and that word is the good news that was preached to you (1 Peter 1:23-25). This is why faithful, Bible-saturated preaching matters so much. The Spirit does not work in a vacuum or apart from the truth; He takes the Word that is preached and makes it effective. A sermon empty of Scripture gives the Spirit little to drive home, but a sermon full of the gospel hands Him the very instrument He delights to use.

This means the preacher’s first task is not to be interesting but to be faithful, to set the Word of God clearly before people and trust the Spirit to do with it what only He can. Paul told the Thessalonians, our gospel came to you not only in word, but also in power and in the Holy Spirit and with full conviction (1 Thessalonians 1:5). Word and Spirit together, that is the pattern. The Spirit in preaching works through the truth proclaimed, not around it.

What this asks of the preacher

If the converting power belongs to the Spirit, then the preacher must be a man of dependence and prayer. I can study all week and still preach in the flesh if I forget to plead with God to come and work. The preacher who relies on his preparation alone, however good it is, has quietly trusted the wrong thing. We labour hard at the text, yes, and then we go into the pulpit leaning wholly on the Spirit to do what our words cannot. That is why I pray before I preach, why I ask others to pray, and why I have learned not to measure a sermon by how I felt delivering it but by whether God was pleased to use it. We say more about the Spirit’s part in reaching the lost in our piece on the Spirit’s role in evangelism and witness.

It also keeps a preacher humble in success and steady in apparent failure. When people are converted, I cannot take the credit, for the Spirit in preaching did what I could not. And when a sermon seems to fall flat and nothing visible happens, I am not crushed, because the results were never in my hands to begin with. I sow and water; God gives the growth (1 Corinthians 3:6-7). That frees a man to preach his heart out and then leave the harvest to the One who alone can bring it.

A pattern as old as Pentecost

None of this is new. From the very first Christian sermon onward, conversion has come through preaching empowered by the Spirit. At Pentecost the Spirit fell, Peter preached, and three thousand were added that day (Acts 2:41). In house after house and city after city through the book of Acts, the same thing recurs: the Word is preached, the Spirit works, and sinners are turned to God. The gospel grew and multiplied not because the apostles were trained orators, for most were unschooled fishermen, but because the Spirit accompanied their plain proclamation with power. The Spirit in preaching is the engine that has driven the advance of the church in every generation since.

That history ought to encourage every ordinary preacher and every small congregation. You do not need a famous name or a large platform for the Spirit to save through the Word you proclaim. The same Spirit who worked through Peter works through the village pastor and the Sunday school teacher and the believer sharing the gospel over a garden fence. Where the Word about Jesus is faithfully spoken, the Spirit in preaching has always been pleased to do His converting work, and He has not changed.

What this asks of the hearer

There is a word here for those who listen as well. If the Spirit converts through the preached Word, then how you listen is no small matter. Come under preaching hungry, prayerful, and ready to obey, asking God to open your own heart as He opened Lydia’s. Do not sit in judgement on the preacher’s delivery while ignoring the God who may be speaking through it. Many a soul has been saved under an ordinary sermon because the hearer came expecting God to work, and many have sat unmoved under a great one because they came only to be entertained or to criticise. The Spirit in preaching meets the receptive heart, the one that says, speak, Lord, for your servant hears (1 Samuel 3:9).

And if you are not yet a believer reading this, understand that the very stirring you may feel under the preaching of the gospel is the Spirit at work, calling you. Do not harden yourself against Him. Today, if you hear his voice, do not harden your hearts (Hebrews 3:15). The conviction you feel is not to be argued away; it is a mercy, the Spirit drawing you to the Saviour while there is still time to come.

So, now what?

If you preach, labour hard at the Word and then lean wholly on the Spirit, refusing to trust your gifts and refusing to despair at your weakness, because the converting power was never yours. If you listen, come hungry and prayerful, asking God to open your own heart under the Word, and do not let the Spirit’s stirring be wasted. And if you are still outside of Christ, take the conviction you feel as the kindness of God drawing you, and come. The Spirit in preaching is still doing today exactly what He did at Pentecost, taking the proclaimed gospel and raising the dead to life. Will you preach, and listen, and respond, as though that were really true?

For our gospel came to you not only in word, but also in power and in the Holy Spirit and with full conviction. (1 Thessalonians 1:5)