'Certain' in the Bible

And I am certain that the king of Egypt will not let you go without being forced.

And Moses, answering, said, It is certain that they will not have faith in me or give ear to my voice; for they will say, You have not seen the Lord.

So that they may be certain that the Lord, the God of their fathers, the God of Abraham, of Isaac, and of Jacob, has been seen by you.

And I will take you to be my people and I will be your God; and you will be certain that I am the Lord your God, who takes you out from under the yoke of the Egyptians.

So the Lord says, By this you may be certain that I am the Lord; see, by the touch of this rod in my hand the waters of the Nile will be turned to blood;

But as for you and your servants, I am certain that even now the fear of the Lord God will not be in your hearts.

Now I am certain that the Lord is greater than all gods, for he has overcome them in their pride.

If then I have grace in your eyes, let me see your ways, so that I may have knowledge of you and be certain of your grace; and my prayer is that you will keep in mind that this nation is your people.