Surely every man goes about like a phantom; surely, he bustles in vain; he heaps up riches not knowing who will haul them away. Psalm 39:6

I hated all for which I had toiled under the sun, because I must leave it to the man who comes after me. And who knows whether that man will be wise or foolish? Yet he will take over all the labor at which I have worked skillfully under the sun. This too is futile. So, my heart began to despair over all the labor that I had done under the sun. Ecclesiastes 2:18-21