NET
17 So I decided to discern the benefit of wisdom and knowledge over foolish behavior and ideas; however, I concluded that even this endeavor is like trying to chase the wind.
Darby
17 And I applied my heart to the knowledge of wisdom, and to the knowledge of madness and folly: I perceived that this also is a striving after the wind.
KJV
17 And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.