For just a minute imagine your Christian walk without the power of the Holy Spirit.
You find organized theology decent and in order. You know what you believe. Your scripturally-informed rational thinking has formed a clear lens that helps you biblically interpret the world. You pray and read Scriptures because that's what Christians do. Yet, without the Holy Spirit, you are dry.
You lack something in your relationship with God. This is the experience of many Christians.
Maybe it was yours too: a Christian walk without the power of the Holy Spirit.