Psalm 100:2Serve the LORD with gladness; come into His presence with joyful songs.
 
The Curses of Disobedience…46These curses will be a sign and a wonder upon you and your descendants forever. 47Because you did not serve the LORD your God with joy and gladness of heart in all your abundance,48you will serve your enemies the LORD will send against you in famine, thirst, nakedness, and destitution. He will place an iron yoke on your neck until He has destroyed you.…-Deuteronomy 28:47