Authored by Ron Paul via The Mises Institute,

Liberty means to exercise human rights in any manner a person chooses so long as it does not interfere with the exercise of the rights of others. This means, above all else, keeping government out of our lives. Only this path leads to the unleashing of human energies that build civilization, provide security, generate wealth, and protect the people from systematic rights violations. In this sense, only liberty can truly ward off tyranny, the great and eternal foe of mankind.

https://www.zerohedge.com/news/2018-08-21/ron-paul-liberty-defined