We say "amen" at the end of a prayer as an affirmation meaning "so be it," "truly," or "let it be so." It comes from the original Hebrew word meaning truth or certainty. By saying amen, we express belief in what was prayed and faithfulness in God who hears the prayer. Essentially, it is a solemn ratification or hearty approval of the prayer's content, confirming that we agree with and trust in God's will and promises. It serves as an exclamation point of faith, acknowledging that God will fulfill His promises and that the prayer is made with confidence in His faithfulness.