What is joy? It is what you feel when you accomplish a certain purpose.
Quotes about joy
From the speeches of Sun Myung Moon and Hak Ja Han
Joy starts from God’s heart, and its purpose is realized in human beings. The heart of the invisible God manifests itself in the heart of a visible human being.
There may be a country which is proud that it has the highest mountain, the largest river, and the greatest land mass in the world. But if it rejoices over this with Satan's heart instead of uniting with the heart of God who created it, will He rejoice?
The greatest joy comes when you pass through the climax of sorrow.
If we had no desires, we could never experience joy.
We can feel joy only when our sorrowful heartistic connection with God surpasses that which Adam and Eve had when they fell.