Final answer:
The 9th Amendment states that the Bill of Rights is not a complete list of citizens' rights, meaning that natural rights exist independently of government.
Step-by-step explanation:
The principle that lies behind the 9th Amendment, which states that the Bill of Rights is not a complete list of citizens' rights, is that natural rights exist independently of government. The 9th Amendment recognizes that the rights of individuals are not limited to those explicitly listed in the Bill of Rights, but also include other rights not mentioned. The purpose of the 9th Amendment is to protect the rights of individuals that may not have been specifically enumerated by the Constitution.
Learn more about The principle behind the 9th Amendment