Constitution: Most important principle

The U.S. Constitution has four main principles; federalism, checks and balances, limited government, and separation of powers and out of those four I think that limited government is the most important because it limits the government. Firstly it keeps the government from stepping all over their citizens, secondly it would work even without checks and balances and separation of powers already doing their parts to limit the government. Finally, without this monopolies would still be around and the economy would come to an even more horrible crash than it already has, and nobody really wants that.