When you hear people say, I have the joy (happiness) of the Lord in my soul, they are referring to un-cut, un-filtered, long suffering, pure unending joy, that's not depended upon great circumstances or when only good things are going on in their lives.
It's the joy in knowing that God is going to be with them through every mountain they have to climb, every low valley they have to go through, every heartache, and every pain. They know 100 percent that God will always be by their side. And, that kind of joy comes with less stress and lots of peace and rest.
Now, that's the World of Joy in the Lord and with this kind of joy, you can think yourself happy!
