Bible Verses About Vanity: Worldly wisdom is

And I said in my heart: If the death of the fool and mine shall be one, what doth it avail me, that I have applied myself more to the study of wisdom? And speaking with my own mind, I perceived that this also was vanity.

For when a man laboureth in wisdom, and knowledge, and carefulness, he leaveth what he hath gotten to an idle man: so this also is vanity, and a great evil.

And again: The Lord knoweth the thoughts of the wise, that they are vain.