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.
Be on your guard; stand firm in the faith; be courageous; be strong. Do everything in love.