'Surely' in the Bible

So I said {to myself}, "God will surely judge the righteous and the wicked, for he has appointed a time [of judgment] for every deed and every work."

Surely oppression makes a fool of the wise, and a bribe corrupts the heart.

Surely there is no one righteous on the earth who [continually] does good and never sins.

Surely no one knows what will be, so who can tell anyone what will happen?