Final answer:
The message suggests a theological link between the Old and New Testaments, with the Old Testament prophecies being fulfilled in the New Testament. This reflects Christian beliefs about the continuity between the two sections of the Bible and the fulfillment of Old Testament figures and laws in the teachings of Christ.
Step-by-step explanation:
The mystery message found inside a bottle that says 'The new is in the old contained, The old is in the new explained' reflects a common theological perspective regarding the relationship between the Old and New Testaments. Christians believe that the Old Testament contains prophecies and teachings that are fulfilled and explained in the New Testament. This concept is evident in the Christian doctrine that sees the New Testament as the culmination of the Old Testament prophecy, where the life of Jesus Christ is seen as the fulfillment of the messianic prophecies from the Hebrew Bible.
Such continuity between the Testaments suggests that Old Testament figures and the Mosaic law, given by Moses, find their ultimate significance and elucidation in the new Christian law under Christ. This understanding reinforces the idea that the mysteries and predictions of the Old Testament are unveiled in the narrative of the New Testament. Additionally, biblical literature, like the book of Revelation, often uses symbolic language but primarily offers messages that are not hidden but rather accessible, similar to how a mechanic 'reads' an engine.