If you had to pick one of the four founding principles as most important which one would you choose and why?

i choose this one now can you please help me explain why i pick this please: the thrid principle of the constitution is the separation of powers. the federal government created under the constitution instituted three branches of authority-the executive,legislative,and judicial branches-distributing portions of national power among each of those branches in general this distribution means that the legislative branches creates or makes the laws the executive branch enforces the law and the judicial branch interprets the law and determines their legitimacy or constitutionality. can some one help me on this one plezzzzzzzzzzzzzz