The Heidelberg Catechism: Lord's Day 8
24. Question: How are these articles divided?
Answer: 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. Question: Since there is only one God, why do you speak of three persons, Father, Son, and Holy Spirit?
Answer: Because God has so revealed Himself in His Word that these three distinct persons are the one, true, eternal God.
 Deut. 6:4; Is. 44:6; 45:5; I Cor. 8:4, 6.  Gen. 1:2, 3; Is. 61:1; 63:8-10; Matt. 3:16, 17; 28:18, 19; Luke 4:18; John 14:26; 15:26; II Cor. 13:14; Gal. 4:6; Tit. 3:5, 6.
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