When you find happiness in God's Word, it comes with benefits. Here is the Bible Minute.
The basis of happiness then is living a life that pleases God and benefits you. Proverbs 3:16 says, "Length of days is in her (right) hand, (And) In her left hand riches and honor."
First of all, "length of days." What he is saying is that when a person discovers real wisdom--the wisdom that's found in God's Word--it adds to the length of your days, because wisdom of God keeps you from doing foolish things that shorten your days. See, there is a clear relationship between the wisdom of God found in the Word of God, and long-term happiness.
For happiness that lasts, you've got to go to the right place. Find more at backtothebible.org.