"You will receive power when the Holy Sprit has come upon you; and you will be my witnesses.” (Acts 1:8)

Mary, you are the mother of Jesus, our Lord.
Your presence in the upper room inspired the first disciples to trust completely in the promise of the Risen Christ. 

I now consecrate myself to you under the title of Our Lady of the Southern Cross, Help of Christians, so that I might be a witness to your Son Jesus in the power of His Spirit.
Mary, teach me to be attentive to the voice of God in silence
and to live a life of service in truth, joy and peace.

Amen.