Ecclesiastes 9:7-10

Go your way, eat your bread with joy and drink your wine with a cheerful heart [if you are righteous, wise, and in the hands of God]; for God has already approved and accepted your works. Let your clothes always be white [with purity], and do not let the oil [of gladness] be lacking on your head. Live joyfully with the wife whom you love all the days of your fleeting life which He has given you under the sun—all the days of vanity and futility. For this is your reward in life and in your work in which you have labored under the sun. Whatever your hand finds to do, do it with all your might; for there is no activity or planning or knowledge or wisdom in Sheol (the nether world, the place of the dead) where you are going.