We are all beginners in the liturgy, really. All of us—from the first-time visitor who finds himself pain helplessly through the Prayer Book wondering what is happening, to the aged priest who has known it all by heart for half a century—are only on the lower slopes of worship. If the great seraphim themselves cover their faces in the presence of the Divine Majesty, who of us will claim to be experts at the act of approaching the Throne with offerings of adoration and praise.

From The Liturgy Explained. (The old edition)