'Really' in the Bible

They kept telling the woman, "It is no longer because of what you said that we believe, because now we have heard him ourselves, and we know that he really is the Savior of the world."

And look, he is speaking in public, and they are not saying anything to him! Can it be that the authorities really know that this is the Messiah?

When they heard these words, some in the crowd were saying, "This really is the Prophet,"

So Jesus told those Jews who had believed in him, "If you continue in my word, you are really my disciples.

Then the Jewish leaders told him, "Now we really know that you have a demon. Abraham died, and so did the prophets, but you say, "If anyone keeps my word, he will never taste death.'