Learn from him.
See The Declaration of Independence..."endowed by their Creator with certain unalienable Rights"
Definition for unalienable is "Not to be separated, given away, or taken away;"
This means that all speach is protected unless it infringes upon the unalienable rights of another, such as presents an imminent threat to the life of another.
All this said, there is seemingly a social reality, that is a loss of freedom realized when public virtue is lost. I would suggest that the best way to fight for liberty is to restore this public virtue.