'Surely' in the Bible

There is no end to all the people; to all who were before them. Yet those who come later will not be happy with him. Surely this also is vanity (emptiness) and chasing after the wind.

For oppression makes a wise man foolish,And a bribe corrupts the [good judgment of the] heart.

Indeed, there is not a righteous man on earth who always does good and who never sins.

Though a sinner does evil a hundred times and his life [seemingly] is prolonged [in spite of his wickedness], still I know that it will be well with those who [reverently] fear God, who fear and worship Him openly [realizing His omnipresence and His power].