God's desire for us is that we human beings with these three parts are vessels to contain and express it. As we have seen, God's purpose is to enter into our spirit and fill it with himself. When we believe in Jesus Christ, He comes to live in us as our new life. He is in our spirit as a new Person within us so that He will be expressed in our whole being: spirit, soul and body. All this happens when we receive him in our spirit and we are regenerated, or born again.
Thanks for sharing @laramrm.