The Annunciation

Mary was full of grace, which means she was not full of personal merit. She was chosen because she was nobody.

So also have we been chosen and given grace, not in view of our merit and worthiness, but because of the love of God.

And as in the tiny space of Mary's womb a wondrous union with God occurred, so in also in us who receive the Holy Sacrament does this union occur.

The sermon.