'Certain' in the Bible

And our hope for you is certain; in the knowledge that as you take part in the troubles, so you will take part in the comfort.

And being certain of this, it was my purpose to come to you before, so that you might have a second grace;

For he is the Yes to all the undertakings of God: and by him all the words of God are made certain and put into effect, to the glory of God through us.

And I said this very thing in my letter, for fear that when I came I might have sorrow from those from whom it was right for me to have joy; being certain of this, that my joy is the joy of you all.

And for the same reason I sent you a letter so that I might be certain of your desire to do my orders in all things.

And this is the certain faith which we have in God through Christ:

Because we are certain that he who made the Lord Jesus come back from the dead, will do the same for us, and will give us a place in his glory with you.

And we have sent with them our brother, whose ready spirit has been made clear to us at times and in ways without number, but it is now all the more so because of the certain faith which he has in you.

This is the third time that I am coming to you. From the mouth of two or three witnesses will every word be made certain.

Make a test of yourselves, if you are in the faith; make certain of yourselves. Or are you not conscious in yourselves that Jesus Christ is in you, if you are truly Christ's?