"In October we celebrate the feast of St Francis, the patron of animals and the environment. We cherish his words, and through the generations men and women have passed on his charism. His influence continues to spread far and wide, as a witness to Jesus that is deeply rooted in our lived experience. He is both rooted in the Christian tradition and idealistic—a challenge to the powerful and a hope for the powerless. Francis’ influence lives on in us today as yeast: an agent of inspiration, of the Spirit, of the reign of God in our midst." Elizabeth Young is a Sister of Mercy and a member of Australian Religious Response to Climate Change. Here, she reflects on the radical nature of St Francis' attitude toward God and creation and the ever-present call to ‘care for our Common Home’.