6 Bible Verses about Toiling In Vain

I am afraid of you, lest somehow I have labored toward you in vain.

What profit has man from all his labor in which he labors under the sun?

For what has a man of all his labor, and of the striving of his heart in which he labors under the sun?

Thus says LORD of hosts: The broad walls of Babylon shall be utterly overthrown, and her high gates shall be burned with fire. And the peoples shall labor for vanity, and the nations for the fire, and they shall be weary.

They have sown wheat, and have reaped thorns. They have put themselves to pain, and profit nothing. And ye shall be ashamed of your fruits, because of the fierce anger of LORD.

Behold, is it not of LORD of hosts that the peoples labor for the fire, and the nations weary themselves for vanity?