[T]he power that changes the world and transforms it into the Kingdom of God, in silence and without fanfare, is faith - and prayer is the expression of faith. When faith is filled with love for God, recognized as a good and just Father, prayer becomes persevering, insistent, it becomes a groan of the spirit, a cry of the soul that penetrates God's Heart. Thus, prayer becomes the greatest transforming power in the world. In the face of a difficult and complex social reality, as yours certainly is, it is essential to strengthen hope which is based on faith and expressed in unflagging prayer.

Today, let us repeat together with humble courage: Lord, in coming among us at this Sunday celebration you find us gathered together with the lamp of faith lit. We believe and trust in you! Increase our faith!

(Pope Benedict XVI, Homily in Naples, 21 October 2007)