Shaikh Sharfuddin Maneri (14th century) is also known as Makhdum-ul-Mulk, or Master of the Kingdom. Born near Patna in Behar, India, he was initiated by Najibuddin Firdausi and was equally proficient in secular learning and esoteric knowledge. The present book consists of the translation of extracts from the Maktubat-i-Sadi ("The Hundred Letters," or rather essays on definite subjects), the most elaborate and comprehensive of his works.