The Holy Spirit is active in many areas throughout Scripture. Here is a short (and far from conclusive) list of some of the things that identify His purpose:
1. He speaks. Acts 13:2
2. He intercedes. Romans 8:26
3. He testified. John 15:26
4. He oversees. Acts 20:28
5. He guides. John 16:13
6. He teaches. John 14:26
7. He created. Genesis 1:1-2
8. He regenerates in salvation. John 3:3, 8
9. He raised Jesus from the dead. Romans 8:11
10. He completes salvation. 1 Corinthians 6:11
11. He seals us in salvation. Ephesians 1:13
12. He leads believers. Romans 8:14; Galatians 5:18