Watch The 4th Cup & Lamb of God (2013) : Full Movie Online Free “The Eucharist is ‘the source and summit of the Christian Life.’” Thank you for visiting the4thcup.com. We hope that you enjoy this presentation and come to a better understanding of the beauty and reality of the Eucharist. If you are looking for a way to deepen your Catholic faith, listen to this presentation of The 4th Cup.