Bishop Athanasius Schneider defines liturgy, Scripture, and Sacred Tradition and shows how they all are essentially dependent on one another. He teaches how to evaluate which magisterial teachings must be believed. The bishop uses quotations from Saint Augustine of Hippo, Saint Vincent of Lerins, and Saint Thomas Aquinas, along with the writings of Dom Prosper Gueranger, to provide guidance for anyone, priest or layperson, in the face of the Protestantized state of the non-traditional liturgy and related recent departures from the traditional teachings and practices of the Church. Bishop Schneider is the author of two books: Dominus Est – It is the Lord!, and Propter Sanctam Ecclesiam Suam (not yet available in English.) He is the General Secretary of the Bishops’ Conference of Kazakhstan and Titular Bishop of Celerina.