Then I looked on all the works that my hands had wrought, and on the labour that I had laboured to do: and, behold, all was vanity and vexation of spirit, and there was no profit under the sun. And, behold, all was vanity - Emptiness and insufficiency in itself.
And vexation of spirit - Because it promised the good I wished for, but did not, could not, perform the promise; and left my soul discontented and chagrined.