'Joyful' in the Bible

In the day of prosperity be joyful, but in the day of adversity consider: God also hath set the one over against the other, to the end that man should find nothing after him.

Then I commended mirth, because a man hath no better thing under the sun, than to eat, and to drink, and to be joyful: for that shall abide with him in his labor all the days of his life which God hath given him under the sun.

Go ahead and enjoy your meals as you eat. Drink your wine with a joyful attitude, because God already has approved your actions.

For mirth they are making a feast, And wine maketh life joyful, And the silver answereth with all.