What is the price of freedom as stated by President Thomas Jefferson?

The concept of "eternal vigilance" as the price of freedom reflects the idea that preserving liberty requires ongoing attention, awareness, and active safeguarding of rights and freedoms. This sentiment emphasizes that freedom is not simply given or guaranteed; instead, it must be actively defended against threats, both external and internal. Jefferson's assertion suggests that citizens must remain alert and engaged to prevent the erosion of their freedoms and ensure that their democratic principles are upheld.

The other choices, while significant in their own right, do not encapsulate the specific meaning associated with Jefferson's perspective. Knowledge and learning are crucial for informed citizenship, active participation in governance is essential for democracy, and commitment to one's principles is vital for personal integrity, but none of these captures the idea that vigilance—being watchful and proactive—is paramount in maintaining freedom as Jefferson articulated.