17 And I (A)applied my heart to know wisdom and to know (B)madness and folly. I perceived that this also is but (C)a striving after wind.
18 For (D)in much wisdom is much vexation, and he who increases knowledge increases sorrow.
The Holy Bible, English Standard Version. ESV® Text Edition: 2016. Copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.