Do we add works to the gospel when we call nonbelievers to repent?

We are saved by grace through faith, and it is not our doing. Ephesians 2:8–9 makes that clear. But the call of the gospel, particularly from the teachings of the Lord Jesus Christ, is a call to repentance and belief (Mark 1:14–15).

It is what the earlier question addressed—the good news is also bad news at the same time. So, repentance is the acknowledgment of my guilt before God; it is the confession and the relinquishing of my sin. And salvation is my receiving of His grace through the finished work of Jesus Christ.