Read Zephaniah 3:17 and Nehemiah 8:9-10. What do these passages teach us about joy?

Zephaniah 3:17

17 The Lord, your God, is in your midst,
a warrior who gives victory;
he will rejoice over you with gladness,
he will renew you[a] in his love;
he will exult over you with loud singing

Nehemiah 8:9-10

9 And Nehemiah, who was the governor, and Ezra the priest and scribe, and the Levites who taught the people said to all the people, “This day is holy to the Lord your God; do not mourn or weep.” For all the people wept when they heard the words of the law. 10 Then he said to them, “Go your way, eat the fat and drink sweet wine and send portions of them to those for whom nothing is prepared, for this day is holy to our Lord; and do not be grieved, for the joy of the Lord is your strength.”