Terry Pratchett.
No one, absolutely no one was able to master so many different styles, from theologist essays (smaller gods) to thriller novel (all the guards trilogy) . And in all of them you can find many quotes that could be at the same level as some of the best philosophers in the old continent.
His novel defended the igualitary access to almost everything (equal rites, witches) , decompose social classes (almost in every book) ,speaks about slavism (the golem set of books) and how the things interact to each other in order to create the society we know. And more important, it also show how difficult is to change it.
I addition you could find great explanation of the most important secrets of the universe, and last but not least, in some books he show an exquisite sense of humor.
I understand that his style is not for everybody, and first time it could even generate a rejection. But which genius of its area didn't create such feeling??
It is time to start recognizing him as the genius and master he is.