Q. 53 What do you believe concerning “the Holy Spirit”?
A.  First, he, as well as the Father and the Son, is eternal God.  Second, he has been given to me personally, so that, by true faith, he makes me share in Christ and all his blessings, comforts me, and remains with me forever.

Gen. 1:1-2; Matt. 28:19; Acts 5:3-4
1 Cor. 6:19; 2 Cor. 1:21-22; Gal. 4:6
Gal. 3:14
John 15:26; Acts 9:31
John 14:16-17; 1 Pet. 4:14