'Certainly' in the Bible

We certainly believe that it is through the grace of the Lord Jesus, the Messiah, that we are saved, just as they are."

But Paul told the guards, "The magistrates have had us beaten publicly without a trial and have thrown us into jail, even though we are Roman citizens. Now are they going to throw us out secretly? Certainly not! Have them come and escort us out."

What is to be done? They will certainly hear that you have come.