On reflection this might have been a better sermon for Trinity Sunday, but the text was John 15:25-26 and John 16:4-15 and that came up on Pentecost. The core statement is that we moderns just don’t biblically undertand the Spirit or the personhood of God. We push Father, Son and Spirit together into a giant gnostic generic Spirit-God. When you do that, your God ends up looking like you and not like He revealed Himself in the Scriptures.
Specifically the Holy Spirit is not a mushy person. His first job is to convict the world: To convict it of sin, convict it of true righteousness, and convict it of who is the judge. After that conviction, the Spirit leads His people into all truth. A great text pointing to law and gospel. First we are convicted by the law and then restored in truth by the gospel. The Spirit does this through His means of Word and Sacrament through that fuddy-duddy place called the church. The adversary tries to sow a bunch of FUD becuase we’ve mushed the persons together. He tries to get us to find the Spirit everywhere but right there in the Word and Sacrament to the point we often denigrate the gospel offer thinkning God can’t really be there. But God keeps his promises. He’s there in that Word, Water, Bread and Wine.