Typically it is not possible to ascertain what an author means by these terms.

However, could you explain what the author meant by "being everywhere in the universe at once?"

The author means that in fact Matthew's words were not at all clear to him.

It says that because words are not precise, we can never know what an author meant.

All tell us things their authors perhaps did not mean to.

"I don't think that's the way the author meant his book to be read," she said.

"I think you should read the book the way the author meant."

Just a few words to tell what the main author means with "specific".

What does an author mean with a certain phrase or word?

That's what the authors mean by the ability to exploit the "knowledge economy."