John 16:13, “When the Spirit of truth comes, He will guide you into all the truth, for He will not speak on His own authority, but whatever He hears He will speak, and He will declare to you the things that are to come.”
This is why the New Testament is regarded as Scripture alongside the Hebrew Scriptures, for what the apostles wrote and preached they heard from the Holy Spirit. The Holy Spirit spoke to them the Word of God, and the Word of God is always Scripture. In this sense, as Luther says, the Holy Spirit is a preacher. Therefore, we do not need to attempt to venture into the hidden mind of God, as the theologian of glory does. We have all we need to know—all God wants us to know—in the Holy Scriptures.
There is too much talk about “feeling the Holy Spirit” among Christian evangelicals. The Holy Spirit’s job is not to let you “feel” Him, but to preach the Word of Christ and to point you to Christ. Thus, if you wish to feel the Holy Spirit, put your hand into the baptismal font and feel the waters, where you received Him in your Baptism. If you wish to hear the Holy Spirit, listen to the words of the Gospel, which He spoke to the apostles and the gospel writers.
The Lutheran Column 