You can learn about it here:
Mary Sumner started meeting with mothers of her parish in 1876 Mary wrote the first Mothers' Union prayer..
All this day, O Lord,let me touch as many lives as possible for thee; and every life I touch, do thou by thy spirit quicken, whether through the word I speak, the prayer I breathe, or the life I live. Amen.
The current prayer, like the original, focuses on the real concerns and needs of women throughout the world.
Loving Lord, We thank you for your love so freely given to us all. We pray for families around the world. Bless the work of the Mothers' Union as we seek to share your love through the encouragement, strengthening and support of marriage and family life. Empowered by your Spirit, may we be united in prayer and worship, and in love and service reach out as your hands across the world. In Jesus' name. Amen
Almighty God, we pray that You will bless our work in mission and ministry in the world. Help us to pray fervently, labor diligently and give liberally to make known the power of your love given through your son Jesus Christ. Let us not forget the lessons from the past nor fear the challenges of the future. Anoint us with your grace and shine in our hearts as we reflect your light throughout the world. Amen.