Ecc 1:17 And I applied my heart to know wisdom and to know madness and folly. I perceived that this also is but a striving after wind.

Ecc 2:22 What has a man from all the toil and striving of heart with which he toils beneath the sun?
Ecc 4:16 There was no end of all the people, all of whom he led. Yet those who come later will not rejoice in him. Surely this also is vanity and a striving after wind.

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