'Certain' in the Bible

Sure enough, the advisors to the king of Aram told him, "Their gods are mountain gods. That's why they were stronger than we were. But when we fight them on the plains, we're certain to be the stronger army!

Then replace the army that you lost, horse-for-horse and chariot-for-chariot. We'll fight them on the plains, and we're certain to be the stronger army." Ben-hadad listened to what they had to say and carried out their advice.