What are the Four Decrees and what do they have to do with the New Covenant? ALL scripture is God-breathed and useful for the edification and correction of the Believer. Why hasn't the Church at large taught the Four Decrees as a basic tenet of our faith? They are part of the Mystery that Paul writes about. A mystery is a hidden truth that can be seen only through divine revelation. Unveiling the New Covenant-The Four Decrees is a strong revelatory teaching. Please read this work carefully and check it with the Word.