Martin Luther

Finally, mark this, that you must always make the AMEN strong, never doubting that God is surely listening to you with all grace and saying YES to your prayer. Remember that you are not kneeling or standing there alone, but that all Christendom, all devout Christians are standing there with you and you with them in one unanimous, united prayer which God cannot ignore. And never leave off praying without having said or thought: There now, this prayer has been heard by God; this I know of a certainty. That is what ‘Amen’ means.