Salvation, Justification, Sanctification, Transformation: Could you clarify the differences between salvation, justification, sanctification and how the need for repentance fits in? [I Thessalonians 4:3, I Thessaloninas 5:23, 2 Corinthians 7:1, I Peter 1:15]. Repentance-Only Needed Once: Is there only the one repentance when we first repent and receive Christ? [I John 1:9, I John 1:7, Galatians 5:16-17].