According to my research on the promises and rights provided by the United States of America to it's citizens, I can say that based on the information provided within the question it is referring to the term known as "liberty". This term (like mentioned in the question) refers to a person's freedom in every sense of the word and is the foundation on which the United States was founded.
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It is false that the scribes emphasized that the law was a matter of the heart, not just good outward behavior. They emphasized both of these things, not only one.