God will fill your mouth with laughter

 “He will yet fill your mouth with laughter, and your lips with shouting.” (Job 8:21 ESV)

There is a time for laughter

“A time to weep, and a time to laugh; a time to mourn, and a time to dance.” (Eccles. 3:4 ESV)

Have enjoyment in your work

“There is nothing better for a person than that he should eat and drink and find enjoyment in his toil. This also, I saw, is from the hand of God,” (Eccles. 2:24 ESV)

This is God’s gift to man

“Also that everyone should eat and drink and take pleasure in all his toil—this is God's gift to man.” (Eccles. 3:13 ESV)

It’s like medicine

“A joyful heart is good medicine, but a crushed spirit dries up the bones.” (Prov. 17:22 ESV)

Do it to the glory of God

“So, whether you eat or drink, or whatever you do, do all to the glory of God.” (2 Cor. 10:31 ESV)

“Rejoice in the Lord always; again I will say, Rejoice.” (Phil. 4:4 ESV)

For God has blessed you

“And there you shall eat before the Lord your God, and you shall rejoice, you and your households, in all that you undertake, in which the Lord your God has blessed you.” (Deut. 12:7 ESV)