The Heidelberg Catechism

Lord's Day 8

Question & Answer 24

Q: How are these articles divided?

A: Into three parts:
God the Father and our creation;
God the Son and our deliverance;
God the Holy Spirit and our sanctification.

Question & Answer 25

Q: Since there is but one God,1 why do you speak of three: Father, Son, and Holy Spirit?

A: Because that is how
God has revealed himself in his Word:2
these three distinct persons
are one, true, eternal God.

1 Deut. 6:4; 1 Cor. 8:4, 6
2 Matt. 3:16-17; 28:18-19; Luke 4:18 (Isa. 61:1); John 14:26; 15:26;
2 Cor. 13:14; Gal. 4:6; Tit. 3:5-6