Catherine McAuley (1778-1841), the founder of the Sisters of Mercy in 1831, frequently gave oral instructions to the first Mercy community. Though she sometimes spoke explicitly about their religious vows, her words were always focused on the life, example, teachings, and evangelic spirit of Jesus Christ, emphasizing resemblance to him and fidelity to the calls of the Gospel. Her instructions have, therefore, a broad present-day relevance that can be inspiring and encouraging for all Christians. They are the shining words of a companion, a soul-friend, who offers guiding light to those who wend their pilgrim way toward the full embrace of God’s merciful reign. These instructions were initially written down, insofar as that was humanly possible, by sisters who were actually present and listening as she spoke. Some of their manuscripts were later copied into the long manuscript compilation that is the centerpiece of this book. Research also indicates that in preparing and giving her lectures, Catherine often relied on the content of previously published spiritual books, including works by Alphonsus Rodriguez, SJ, Louis Bourdaloue, SJ, and other well-known spiritual writers of the eighteenth and earlier centuries. The book’s endnotes illustrate this dependence. Catherine McAuley’s voice in these instructions is realistic, down-to- earth, humble, and compassionate. She is clearly dead-set against froth and mere outward show in one’s spiritual life. Like the practical Saint Teresa of Avila, whose life and thought she studied, she favors surrendering oneself now, with God’s help, to ordinary, every-day, possible holiness, rather than simply dreaming about extraordinary, but perhaps impossible, future sanctity. Her themes are some of the great themes of the Gospel: genuine humility and poverty of spirit, universal charity, self-denial, taking up one’s cross, and following Jesus Christ.