'Certainly' in the Bible

"I have certainly stayed silent for a long time; I've kept still and held myself back. Now, like a woman giving birth, I'll cry out. All of a sudden I'll gasp and pant.

I am calling a bird of prey from the east, and from a far country a man with his purpose. Indeed, I've spoken; I will certainly make it happen; I've planned it; and I will certainly carry it out.