In this work, the author combines the works of early scholars, like Ibn al-Jawzee and Ibn Rajab, as well as modern scholars to study the spiritual disease of Riyaa. The result is a very comprehensive, yet concise, treatise on the subject of Riyaa’ in which all the hadith references are verified and authenticated, as well as English hadith references identified. It is, without a doubt, a very important edition to the English Islamic library, which presently lacks any specialized works on the topic, Its importance cannot be overstresses, because the character which Islam seeks to build would be incomplete without a clear understanding of this subject.