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In Ecclesiastes, Solomon has tried everything the world has said is good, and found it all vanity ... but returns to this: "Let us hear the conclusion of the whole matter: Fear God, and keep His commandments, for this is the whole duty of man." That's Ecclesiastes 12:13 -- I leave you to read the very last verse on your own time. Solomon was the skeptic who made the experiment to the fullest extent he could, but comes right back to Job's conclusion, and his father David's conclusion (Psalms), and his own earlier wisdom (Proverbs)!