A Bit Of Circular Wisdom:

"The New Testament is Contained in the Old Testament. The Old Testament is Explained in the New Testament. The New Testament is Concealed in the Old Testament. The Old Testament is Revealed in the New Testament. The New Testament Authenticates the Old Testament. The Old Testament Anticipates the New Testament. The New Testament Lies Hidden in the Old Testament. The Old Testament Lies Open in the New Testament. The Old Testament Predicts a person. The New Testament Presents that Person."--Food for Thought by Roy Gustafson Shows that we can't have one without the other and that the Bible is the greatest commentary on the Bible.