Greetings!
The basis of Christian joy is Jesus Himself, who is the Rock of Ages, that through the Holy Spirit, He is able to fill our soul with inexpressible and glorious joy.
Genuine article of joy comes from our soul and dwells within us. It INHABITS our lives. No matter what the situation is, we can still find the joy within. Whereas, a counterfeit one is temporal. It comes and goes. Its only a VISITATION to our daily lives.