You have changed my mourning into dancing, O Lord my God.

"The disciples were filled with joy and the Holy Spirit."  (Acts 13: 52 RM)

You may call the above Scripture the Mark of the Disciple.
If you are a Christian and you are not joyful, then something is wrong.  Did you receive the Holy when you were confirmed? Are you living in sin?  Perhaps some secret illicit pleasure that offends the Holy Spirit of Jesus?
"Brothers, what shall we do?"  (2: 37)
Repent and confess your sins and you will once more be filled with the Holy Spirit.  (Cf Acts 2: 38  ).

Pope Francis said:  'true Christians have cheerful faces and eyes full of joy'

"You have changed my mourning into dancing, O Lord, and have girded me with joy, alleluia."  (Psalm 30: 12)

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