'Sure' in the Bible

The king replied, “I know for certain that you are bargaining for time, because you have seen that my command [to you] is firm and irrevocable.

Just as you saw that a stone was cut out of the mountain without hands and that it crushed the iron, the bronze, the clay, the silver and the gold, the great God has revealed to the king what will take place in the future; so the dream is true and its interpretation is trustworthy.”

And in that it was commanded to leave the stump with the roots of the tree [in the earth], your kingdom shall be restored to you after you recognize (understand fully) that Heaven rules.