Then he said to them, “Go your way. Eat the fat and drink sweet wine and send portions to anyone who has nothing ready, for this day is holy to our Lord. And do not be grieved, for the joy of the Lord is your strength. Nehemiah 8:10
A joyless spirit saps our strength. Our joy in the Lord extends beyond superficial feelings of happiness. Joy produces strength, and strength produces endurance, and endurance produces character, and character produces hope, and hope does not put us to same.
We must never lose our joy.
If you are not feeling the joy of the Lord, then you may need to go back to the Word.
And all the people went their way to eat and drink and to send portions and to make great rejoicing because they had understood the words that were declared to them. Nehemiah 8:12