The Conclusion
All confessions & catechisms · Small Catechism · The Lord's Prayer
For thine is the kingdom, and the power, and the glory, forever and ever. Amen.
What does this mean?
It means that I should be certain that such petitions are acceptable to our heavenly Father and are heard by him, for he himself has commanded us to pray in this manner and has promised to hear us. So we pray with confidence: “Amen,” meaning, “Yes, it shall be so.”