1 Corinthians 3:20 And again, The Lord knoweth the thoughts of the wise, that they are vain.
Ecclesiastes 2:15 Then said I in my heart, As it happeneth to the fool, so it happeneth even to me; and why was I then more wise? Then I said in my heart, that this also [is] vanity.
Ecclesiastes 2:21 For there is a man whose labour [is] in wisdom, and in knowledge, and in equity; yet to a man that hath not laboured therein shall he leave it [for] his portion. This also [is] vanity and a great evil.