Bible Verses About Vanity: Worldly wisdom is

Then I said in my heart, “As it happens to the fool, so will it happen even to me; and why was I then more wise?” Then I said in my heart that this also is vanity.

For there is a man whose labor is with wisdom, with knowledge, and with skillfulness; yet he shall leave it for his portion to a man who has not labored for it. This also is vanity and a great evil.

And again, “The Lord knows the reasoning of the wise, that it is worthless.”