Ecclesiastes 2:17-20
English Standard Version
18I 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,
19and 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.
20So I turned about and gave my heart up to despair over all the toil of my labors under the sun,