'Really' in the Bible

Let no one deceive himself. If any of you thinks he is wise in the ways of this world, he must become a fool to become really wise.

You already have all you want! You have already become rich! You have become kings without us! I wish you really were kings so that we could be kings with you!

To married people I give this command (not really I, but the Lord): A wife must not leave her husband.

If anyone thinks he really knows something, he has not yet learned it as he ought to know it.

Isn't he really speaking for our benefit? Yes, this was written for our benefit, because the one who plows should plow in hope, and the one who threshes should thresh in hope of sharing in the crop.