Romano Guardini 
The Spirit of the Liturgy [EPUB ebook] 

Originally written in 1918, this profound reflection on the nature of liturgical worship still stands as a guiding light for today’s renewal of worship and prayer. In poetic terms, it clarifies the underlying principles and existential implications of the belief that when Christians join in the Eucharist and other liturgical celebrations, they do so not as discrete individuals but as interconnected members of the one People of God.