Chapter 3 — Part I: The Creed — Article I: I Believe in God, the Father Almighty, Creator of Heaven and Earth
Section 22. God Is Called Father Because He Adopts Christians Through Grace — But God, particularly in the New Testament, is much more frequently, and in some sense peculiarly, called the Father of Christians, who have not received the spirit of bondage again in fear; but have received the spirit of adoption of sons (of God), whereby they cry: Abba (Father). For the Father hath bestowed upon us that manner of charity that we should be called, and be the sons of God, and if sons, heirs also; heirs indeed of God, and joint-heirs with Christ, who is the first-born amongst many brethren, and is not ashamed to call us brethren. Whether, therefore, we look to the common title of creation and Providence, or to the special one of spiritual adoption, rightly do the faithful profess their belief that God is their Father.