Heidelberg Catechism: 'Since there is only one God, why do you speak of three: Father, Son, and Holy Spirit?'
I believe in God the Father Almighty, Maker of heaven and earth. And in Jesus Christ, His only-begotten Son, our Lord; who was conceived by the Holy Spirit, born of the virgin Mary; suffered under Pontius Pilate, was crucified, dead and buried; He descended into hell; the third day He rose again from the dead; He ascended into heaven, and sits on the right hand of God the Father Almighty; from there He shall come to judge the living and the dead. I believe in the Holy Spirit; a holy catholic Church; the communion of saints; the forgiveness of sins; the resurrection of the body, and the life everlasting. Amen
(Apostles Creed)
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LORD’S DAY 8
24. How are these articles divided?Into three parts: the first is about God the Father and our creation; the second, about God the Son and our redemption; the third, about God the Holy Spirit and our sanctification.
25. Since there is only one God,1 why do you speak of three: Father, Son, and Holy Spirit?
Because God has so revealed Himself in His Word,2 that these three distinct Persons are the one, true, eternal God.
1 Deut 6:4; Isa 44:6, 45:5; 1 Cor 8:4, 6; 2 Gen 1:2-3; Isa 61, 63:8-10; Mt 3:16-17, 28:18-19; Lk 4:18; Jn 14:26, 15:26; 2 Cor 13:14; Gal 4:6; Tit 3:5-6

