In this work, the author has combined the efforts of early scholars, like Ibn al-Jawzee and Ibn Rajab, with that of modern scholars like Salim al-Hilali and Abd-al-Aziz Abd-al-Latif, to study the spiritual disease 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. In English, with quotes in Arabic with translation. It is without a doubt, a very important addition to the English Islamic library, which presently lacks any specialized works on the topic. Its importance cannot be over-stressed, because the character which Islam seeks to build would be incomplete without a clear understanding of this subject.