In the bible we clearly see that Jesus taught of spiritual and physical joy. But today Christian scholars do not understand this. Because they don't know the teaching of Divine Principle they believe joy is one. Clearly we have a physical and a spiritual joy. Father has explained that we experience both.
Spiritual joy comes from love.
Physical joy comes from sexuality, good food, clothing etc. In the Greek orthodox church they have monasteries deep in the mountains. These monks live a life of prayer. They do not experience physical joy, but they experience a very special spiritual joy. Therefore we cannot denounce their way of life as crazy.