It's possible you are thinking of:
* Pope Pius: There have been many Popes with the name "Pius," each having written various theological and pastoral works. To identify the specific writings you're interested in, you would need to specify which Pope Pius you're referring to.
* A less known author: There might be an author named Pius, but they are not well-known or their work is not widely recognized.
Please provide more context or information about the author "Pius" so I can assist you further.