“We have not so much heard whether there is a Holy Spirit”
So, if you did not know the Holy Spirit exists- He does. But have you met Him, encountered Him, or dwell with Him daily? The Holy Spirit is apart of the Trinity; the Father, the Son, and the Holy Spirit. You can not have one without the other. When you dwell and daily walk with Jesus, He is faithful to pour out the Holy Spirit in your life. It is not a matter of giving attention to one part of the Trinity over the other. It is simply keeping Jesus at the center of it all.