KJV:
And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.
NASB:
And I set my mind to know wisdom and to know madness and folly; I realized that this also is striving after wind.
KJV:
For what hath man of all his labour, and of the vexation of his heart, wherein he hath laboured under the sun?
NASB:
For what does a man get in all his labor and in his striving with which he labors under the sun?
KJV:
There is no end of all the people, even of all that have been before them: they also that come after shall not rejoice in him. Surely this also is vanity and vexation of spirit.
NASB:
There is no end to all the people, to all who were before them, and even the ones who will come later will not be happy with him, for this too is vanity and striving after wind.