According to Ecclesiastes 1:7, all the rivers flow into the sea, yet what?

Answer: The sea is never full

"All the rivers flow into the sea, yet the sea is never full"—one of the Teacher's pictures of endless repetition.

“All the rivers flow into the sea, yet the sea is never full; to the place from which the streams come, there again they flow.”— Ecclesiastes 1:7 (BSB)