"I Thirst: 40 Days with Mother Teresa" is a devotional book by Joseph Langford, M.C., published by Augustine Institute in 2018. This paperback edition is the Second Catholic Edition, intended for young adults and adults looking to deepen their spiritual practice through daily reflections inspired by the life and teachings of Mother Teresa. With a focus on inspirational and religious topics, this book offers a 40-day journey of devotion and spiritual growth, making it a valuable resource for those seeking guidance and inspiration in their faith journey.