(Biographies) Jonathan Edwards - John Piper 

The question is did Jonathon edwards know what the law of liberty is? James 1:25 My guess is that he did because he spoke of being born again and that is involved with the law of liberty. This is why he had to preach open air because none of the churches wanted anything to do with him. The question is does John piper know what the law of liberty is. If he does not it means he is a false teacher. It's easy to prove he teaches truth by just saying what the law of liberty is. If he can't say it, it means he's a false teacher