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Why Did Martin Luther Write the Ninety-Five Theses?

Direct Answer Martin Luther wrote the Ninety-Five Theses in 1517 to dispute the preaching and sale of indulgences. The document circulated in print and helped set the Protestant Reformation in motion. Its original form was an invitation to debate.

Illustrated portrait of Martin Luther.
Historical portrait reference: 1532 portrait of Martin Luther by Lucas Cranach the Elder, Statens Museum for Kunst

Published by Vince Baker Ministries ·

How a local dispute traveled

A university argument could stay in one room. Luther’s did not. The Latin theses asked for discussion about indulgences, including the claims made about their spiritual benefits. A surviving printing cataloged by the Library of Congress shows how a text framed for disputation entered a much wider public controversy.

The University Library of Bern traces the movement from the Latin theses to vernacular writing. Luther’s 1518 sermon on indulgences and grace reached German readers in a form that could travel beyond scholars. Comparing the two documents shows what changed when the audience widened. People could discuss the underlying spiritual question in the language they used at home.

What does grace have to do with the dispute?

Romans 1:16–17 (KJV) ties the Gospel to the righteousness of God and to faith. Ephesians 2:8–10 sets grace, faith, and good works in a clear order. Read through verse 10 as well as verses 8 and 9. The passage gives good works a place in the life God makes possible. It also locates the source of salvation in God’s grace.

Put the passage to work

Write down one place where you treat acceptance by God as something you have to purchase or prove. Read Ephesians 2 aloud. Then choose one act of service you can do from gratitude. That distinction can change the way you pray and the way you help someone who feels they have failed.

Scripture to read alongside the history

Historical sources

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Questions & answers

Frequently asked questions

When were the Ninety-Five Theses written?

Luther wrote them in 1517. October 31 is the date traditionally associated with their publication.

Were the theses written in German?

The original theses were in Latin. Luther later published a German sermon on indulgences and grace for a wider audience.