'Certainly' in the Bible

As certainly as God is faithful, we haven't talked to you with mixed messages like that.

For most certainly that which has been made glorious has not been made glorious in this respect, by reason of the glory that surpasses.

For most certainly in this we groan, longing to be clothed with our habitation which is from heaven;

Yes, we who are in this tent certainly do sigh under our burdens, for we do not wish to lay aside that with which we are now clothed, but to put on more, so that our mortality may be absorbed in Life.

Though untrained in public speaking, I am certainly not untrained in knowledge. Indeed, we have always made that clear to you in everything.

Certainly I have not taken advantage of you through any of those whom I have sent to you, have I?