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KJV - And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.
ASV - And I applied my heart to know wisdom, and to know madness and folly: I perceived that this also was a striving after wind.
BBE - And I gave my heart to getting knowledge of wisdom, and of the ways of the foolish. And I saw that this again was desire for wind.
WEB - I applied my heart to know wisdom, and to know madness and folly. I perceived that this also was a chasing after wind.
YLT - And I give my heart to know wisdom, and to know madness and folly: I have known that even this `is' vexation of spirit;