And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.
15That which is crooked cannot be made straight: and that which is wanting cannot be numbered.
17And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.
18For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.
Also read this verse in