Thank you all so much for your help and advice. The retreat was an enormous success and I thought I'd share with you the readings I chose (Monsignor thought they were the perfect readings for the weekend).
For he is our peace, he who made both one and broke down the dividing wall of enmity, through his flesh, abolishing the law with its commandments and legal claims, that he might create in himself one new person in place of the two, thus establishing peace, and might reconcile both with God, in one body, through the cross, putting that enmity to death by it.
He came and preached peace to you who were far off and peace to those who were near, for through him we both have access in one Spirit to the Father.
So then you are no longer strangers and sojourners, but you are fellow citizens with the holy ones and members of the household of God, built upon the foundation of the apostles and prophets, with Christ Jesus himself as the capstone.
Through him the whole structure is held together and grows into a temple sacred in the Lord; in him you also are being built together into a dwelling place of God in the Spirit.
Matthew 6: 25-34
"Therefore I tell you, do not worry about your life, what you will eat (or drink), or about your body, what you will wear. Is not life more than food and the body more than clothing? Look at the birds in the sky; they do not sow or reap, they gather nothing into barns, yet your heavenly Father feeds them. Are not you more important than they? Can any of you by worrying add a single moment to your life-span?
Why are you anxious about clothes? Learn from the way the wild flowers grow. They do not work or spin. But I tell you that not even Solomon in all his splendor was clothed like one of them. If God so clothes the grass of the field, which grows today and is thrown into the oven tomorrow, will he not much more provide for you, O you of little faith? So do not worry and say, 'What are we to eat?' or 'What are we to drink?' or 'What are we to wear?' All these things the pagans seek. Your heavenly Father knows that you need them all.
But seek first the kingdom (of God) and his righteousness, and all these things will be given you besides. Do not worry about tomorrow; tomorrow will take care of itself. Sufficient for a day is its own evil.