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 angels.
The doctrine of justification by faith and good works.
The doctrine of justification by faith alone.

Answer 1

The doctrine of justification by faith alone.

In The Freedom of a Christian (1520) Martin Luther argued that Christians are justified before God by faith alone (sola fide); good works flow from faith but do not contribute to justification.