Teach Us To Number Our Days, however, is more than a simple crafts' book. Baumgarten provides readers with a brief history of the development of Advent in the Christian calendar, as well as detailed explanations of the various Christian symbols that can be used during the season. Paying attention to both the Old and New Testament symbols, as well as the Sundays of Advent and the Great 'O' Antiphons from December 17-23, this book is a complete guide to Advent for individuals, families, and churches.