The Heidelberg Catechism: Lord's Day 13
33. Question: Why is He called God's only begotten Son, since we also are
children of God?
Answer: Because Christ alone is the eternal, natural Son of God. We, however, are children of God by adoption, through grace, for Christ's sake.
 John 1:1-3, 14, 18; 3:16; Rom. 8:32; Heb. 1; I John 4:9.  John 1:12; Rom. 8:14-17; Gal. 4:6; Eph. 1:5, 6.
34. Question: Why do you call Him our Lord?
Answer: Because He has ransomed us, body and soul, from all our sins, not with silver or gold but with His precious blood, and has freed us from all the power of the devil to make us His own possession.
 I Cor. 6:20; I Tim. 2:5, 6.  I Peter 1:18, 19.  Col. 1:13, 14; Heb. 2:14, 15.
The Heidelberg Catechism: Lord's Day 11
29. Question: Why is the Son of God called Jesus, that is, Savior?
Answer: Because He saves us from all our sins, and because salvation is not to be sought or found in anyone else.
 Matt. 1:21; Heb. 7:25.  Is. 43:11; John 15:4, 5; Acts 4:11, 12; I Tim. 2:5.
30. Question: Do those believe in the only Savior Jesus who seek their salvation and well-being from saints, in themselves, or anywhere else?
Answer: No. Though they boast of Him in words, they in fact deny the only Savior Jesus. For one of two things must be true: either Jesus is not a complete Savior, or those who by true faith accept this Savior must find in Him all that is necessary for their salvation.
 I Cor. 1:12, 13; Gal. 5:4.  Col. 1:19, 20; 2:10; I John 1:7.