“Hujjat al-Balagha” is a book by Shah Waliullah.
Apart from a translation of the Quran, Shah Waliullah also wrote books on Hadith, the principles of Hadith, Tafseer and on mystical subjects. But the Hujjat al-Balagha is his most popular book. This book explains how Islam was found suitable for all races, cultures and people of the world and how successfully it solves social, moral, economic and political problems of human beings.
References
Hujjat al-Balagha Wikipedia(Text) CC BY-SA