Question

Which doctrine did Luther propose and defend in The Freedom of the Christian?

The doctrine of papal authority.
The doctrine of eternal security.
The doctrine of justification by faith alone.
The doctrine of angels.
The doctrine of justification by faith and good works.

Answer 1

The doctrine of justification by faith alone.

In The Freedom of the Christian (On Christian Liberty) Luther insists that believers are declared righteous by faith, not by works; good works are the fruit of faith, not the basis of salvation.