Two people endured useless suffering and made futile efforts: one who accumulated and did not eat (use), and the other who learned and did not act.

However much knowledge you read

If there is no action in you, you are ignorant.

He is neither a researcher nor a scholar

A beast of burden with several books on it.

What knowledge or information does that empty-headed person have?

On whom it is either firewood or a book (burden).