So it means nothing, really. Or rather, it means what YOU say it means. Because society doesnt sit on the court, Justice Breyer, you do. And if the constitution has no meaning except what the court says it does in the moment, then it's you that really run things. You, an unelected and unaccountable judge. So basically he admits he considers himself our overlord. Great.
By the way, if the constitution is totally flexible and doesnt have any long term meaning, then precedent cannot exist. How can legal rulings made in the past last longer than the document itself? So assuming precedent does not exist in his world, how does Justice Breyer feel about the prior rulings that say basically we all work for the government because of the interstate commerce clause? I say "Oh that was in the 1930s! But this is the 21st century and now it means the government cannot meet unless the states all agree to convene it!" How's that work!?
What he is saying that just because our rights descend from God doesn’t mean God can’t change his mind.