The Book of Knowledge by Imam al Ghazali
The guides for the road are the learned men, who are the heirs of the Prophet, but the times are void of them now and only the superficial are left, most of whom have been lured by inquity and overcome by Satan. Every one of them was so wrapped up in his immediate fortune that he came to see good as evil and evil as good, so that the science of religion disappeared and the torch of the true faith was extiguished all over the World. They duped people into believing that there was no knowledge except such ordinances of government as the judges use to settle disputes when the mob riots; or the type of argument which the vainglorious display in order to confuse and refute; or the elaborate and flowery language with which the preacher seeks to lure the common folk. They did this, because apart from these three, they could find no other ways to snare illegal profit and gain the riches of the World.
Since this is a calamity afflicting religion and a grave crisis overshadowing it, I have therefore deemed it important to engage in the writing o this book; to revive the science of religion, to bring to light the exemplary lives of the departed imams, and to show what branches of knowledge the prophets and the virtous fathers regarded as useful.
These are the words of Imam Ghazali about 800 years ago.
238 pages, paperback