Work, and the fall

Human work, which was once a pleasure, became a burden only on account of human disobedience.

Work is under God's judgment

Genesis 3:17–19 See also Genesis 5:29

And to Adam He said: “Because you have listened to the voice of your wife and have eaten from the tree of which I commanded you not to eat, cursed is the ground because of you; through toil you will eat of it all the days of your life. Both thorns and thistles it will yield for you, and you will eat the plants of the field. By the sweat of your brow you will eat your bread, until you return to the ground — because out of it were you taken. For dust you are, and to dust you shall return.”

Work is often frustrating

Ecclesiastes 2:22–23 See also Ecclesiastes 2:11, Ecclesiastes 2:18, Ecclesiastes 4:8, Ecclesiastes 5:16–17

For what does a man get for all the toil and striving with which he labors under the sun? Indeed, all his days are filled with grief, and his task is sorrowful; even at night, his mind does not rest. This too is futile.