"I believe in the Holy Spirit." Part of the Apostles' Creed. God is the Father, and the Son, and the Holy Spirit. The Holy Spirit, as I understand it from Scripture is God's active Presence, Power and voice in the world. The Spirit bears witness through God's people to Jesus, as the Messiah and Lord of all, Savior of the world.
All who receive Christ, receive the Spirit, who indwells each believer individually and all believers together corporately. There is a sense in which the Spirit's greatest habitation is through God's people together. The Spirit makes us one in Jesus, part of our witness to the world.
The Spirit enables us to live a holy life. This is a reference to walking in the Spirit. We depend on the Spirit for our spiritual life breath, and for every holy desire from God through his word, Scripture. As we walk in the Spirit we live the life God has for us, the fruit of the Spirit becoming evident in our lives, especially in community. Of course that is interactive, we are not passive (not to say there are no times for passivity as in waiting on God). We depend on the Spirit, but we must walk or live out God's revealed will for us.
The Spirit "comes on" us to empower us for witness, filling us. We witness regardless, especially by our lives, but also by words, not waiting on any special feeling, while in much prayer. But there are those times when we have that sense of the Spirit on us to speak. We must speak, and we must listen to others so speaking. This is for the world of sinners, and also for God's people. The gifts of the Spirit are for each one in Jesus. The Spirit is on us to give us something quite special to do. So that it ends up being Jesus in us, and we in Jesus- doing a work. From a most humble, supposedly menial task that no one may see, to speaking before others, and many other works.
We in Jesus can grieve the Spirit and put out the Spirit's fire. And we need fresh fillings of the Spirit. I know I am empty. I need the Spirit. And we need the Spirit in our midst, as those in Jesus. The world needs the Spirit through seeing Jesus by the Spirit in us- in word and deed.
There is much to be said about the Holy Spirit. We need more of the Spirit. And we worship him, who is God. As the Spirit leads us to the Father through the Son. We worship the One Triune God forever and ever, beginning here and now.
Come, Holy Spirit!