In this episode of Catholic Expression, Father Greg and Christi engage in a lively discussion about faith, focusing on the role of Mary, the significance of the Immaculate Conception, and the nature of doubt in faith. They explore the concept of being open to life through Natural Family Planning and emphasize the importance of trust in God within marriage and family life. The conversation also touches on the miraculous power of Lourdes water and its connection to faith and healing.