18Then they called them in again and commanded them not to speak or teach at all in the name of Jesus. 19But Peter and John replied, "Judge for yourselves whether it is right in God's sight to obey you rather than God. 20For we cannot help speaking about what we have seen and heard."
21After further threats they let them go. They could not decide how to punish them, because all the people were praising God for what had happened. 22For the man who was miraculously healed was over forty years old.
How do we silence these men?
Peter & John could not nor would not stop speaking about the Lord. There was no denying this miraculous healing of the crippled man that so many had just witnessed, in the name of Jesus Christ.
Here is a good example of when minds are closed, even the clearest presentation of the facts can't open them. The Saducces refused to accept Jesus as the Messiah and felt they needed to silence Peter & John before things got out of hand.
Just like Peter & John, we should never give up, but rather pray that the Holy Spirit intercedes in those circumstances. We must pray for all who share God's Word, as missionaries and each one of us "ordinary" followers.