Also, per Ted Cruz or whomever, some go by the "Constructionist", "Originalist" constitution view; what did those who made the Constitution mean?
Then, you can go to what Jefferson, John Adams, etc. said.
To define "personal liberty" in some way, may not be what the Founding Fathers had in mind. In fact, chances are they didn't have that in mind, they wrestled with abortion and other hot issues back in the day as well.