What does the Bible say about the power of the Holy Spirit in salvation?

The role of the Holy Spirit in the application of salvation is foundational within Reformed theology. In 1 Thessalonians 1:5, Paul mentions that the gospel came 'not in word only, but also in power, and in the Holy Ghost.' This highlights that the effectiveness of the gospel in saving sinners is due to the Holy Spirit's divine power, which regenerates the heart, enabling belief and repentance. John 3:8 further illustrates this, saying, 'The wind bloweth where it listeth,' indicating the sovereign work of the Spirit in bringing about spiritual awakening. Therefore, the transformation from death to life is solely attributed to the Holy Spirit, affirming His vital role in the salvation process.