The Didache meaning "Teaching" is the short name of a Christian manual compiled before 300AD. The full title is "The Teaching of the Twelve Apostles." Some Christians thought Didache was inspired, but the church rejected it when making the final decision which books to include in the New Testament.
Didache contained instructions for Christian groups; and its statement of belief may be the first written catechism. It has four parts: the first is the "Two Ways, the Way of Life and the Way of Death;" the second explains how to perform rituals such as baptism, fasting, and Communion; the third covers ministry and how to deal with traveling teachers; the fourth part is a reminder that Jesus is coming again, with quotations from several New Testament passages which exhort Christians to live godly lives and prepare for "that day."
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I do not seek to understand that I may believe, but I believe in order to understand. For this also I believe, –that unless I believed, I should not understand.-- St. Anselm of Canterbury (1033-1109)