How we worship determines what we believe. Prosper of Acquitane, a disciple of Augustine, once wrote ut legem credendi lex statuat supplicandi, the law of prayer determines the law of belief. This is significant for it expresses that how we pray determines what we believe. Exploring Worship engages in a comparative study of Catholic, Evangelical, and Orthodox teachings on corporate worship and suggests classic practices that help deepen the understanding and experience of worship. This is significant in at least four ways. Theologically, it contributes to the important and continuing trialogue among Catholics, Evangelicals, and Orthodox. Historically, it highlights the integrative potential between these three groups, contrary to its history of distrust and outright animosity. Spiritually, many Christians are seeking a deeper devotional expression. Exploring Worship provides an examination of worship rooted in the rich history and traditions of the Church. Pedagogically, this will suggest practices that help deepen the understanding and experience of worship. Exploring Worship invites us to more critically, intentionally, and sympathetically reflect on the ways we worship and its place in our churches.