'Treasure' in the Bible

Also, I collected for myself silver and gold and the treasure of kings and provinces. I provided for myself male singers and female singers, and the delights and pleasures of men—many concubines.

For who [limited by human wisdom] knows what is good for man during his lifetime, during the few days of his futile life? He spends them like a shadow [staying busy, but achieving nothing of lasting value]. For who can tell a man what will happen after him [to his work, his treasure, his plans] under the sun [after his life is over]?