Heidelberg Catechism – Lord’s Day 11
Question 29. Why is the Son of God called Jesus, that is Saviour?
Because He saves us from our sins; and no salvation is to be either sought or found in any other.
Question 30. Do such then believe in the only Saviour Jesus, who seek their salvation and welfare of saints, of themselves, or anywhere else?
No; although they may make their boast of Him, yet in act they deny the only Saviour Jesus. For either Jesus is not a complete Saviour, or they who by true faith receive this Saviour, must have in Him all that is necessary to their salvation.