The principle of "Persons may change but rules should not change" aligns with the concept of a constitutional government. In a constitutional government, the rules and laws are established in a constitution, which acts as a guiding framework for the governance of a country. The principle emphasizes the idea that while individuals in power may change over time, the fundamental rules and principles set forth in the constitution should remain constant and unchanged. This ensures stability, consistency, and continuity in the governance of a nation. It prevents arbitrary changes to the rules based on the whims of those in power, and instead promotes adherence to the established framework of laws and regulations.