17 And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.

18 For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.

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17 Then I applied myself to the understanding of wisdom,(A) and also of madness and folly,(B) but I learned that this, too, is a chasing after the wind.

18 For with much wisdom comes much sorrow;(C)
    the more knowledge, the more grief.(D)

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