The Doxology of the Lord's Prayer

For the kingdom, the power, and the glory are yours, now and forever. Amen

What does "Amen" mean?

Amen means Yes, it shall be so.

We say Amen because we are certain that such petitions are pleasing to our Father in heaven and are heard by him.

For he himself has commanded us to pray in this way and has promised to hear us.