The Christian liturgy-and the Roman liturgy in particular-developed and thrived within a tradition of commentary and meditation that was fundamental for its understanding, running parallel with the same way of approaching Scripture. The rationalist influences that led to the decline and eventual rejection of the mystical or spiritual senses of Scripture in favor of a narrowly-conceived literal sense led to a narrowing of liturgy as well, which was reduced to its material parts and their various functions. While in recent decades the importance of the spiritual sense of Scripture has been reclaimed, its liturgical equivalent remains in shadow. The present book addresses this lacuna with an easy-to-understand summary of the traditional approach to the "forest of symbols" contained in the Roman Mass.