קהלת ג:כב פירוש: רש״י וKohelet Rabbah

I perceived. In all of these.

“I saw that there is nothing better than that a man should rejoice in his actions, as that is his portion; for who will bring him to see that which will be after him?” (Ecclesiastes 3:22).
“I saw that there is nothing better…for who will bring him to see?” Who will bring David to see what Solomon did? Who will bring Solomon to see what will be after him, what Reḥavam did?

That there is nothing better. For man.