Ecclesiastes 2:17-19

So I hated life, because what is done under the sun was grievous to me, for all is vanity and a striving after wind. I hated all my toil in which I toil under the sun, seeing that I must leave it to the man who will come after me, and who knows whether he will be wise or a fool? Yet he will be master of all for which I toiled and used my wisdom under the sun. This also is vanity.