What is the main message in the declaration of independence?

In the American Declaration of Independence, the main idea (or, argument) focuses on the relationship of governed and government. In brief terms, the Declaration argues that there is a two-fold natural (or, as it may also be put, philosophical) truth that regulates this relationship: governments rule only by consent of those it governs and, further, where the government violates the trust implicit in that consent, the governed have the right to overthrow it for the sake of restoring a more natural governance.