Complete collection of Terry Pratchett quotes by subject and cross-referenced
The Shades was the oldest part of the city. If you could do a sort of relief map of sinfulness, wickedness and all-round immorality, rather like those representations of the gravitational field around a Black Hole, then even in Ankh-Morpork the Shades was remarkably like the aforesaid well-known astronomical phenomenon: it had a certain strong attraction, no light escaped from it, and it could indeed become a gateway to another world. The next one. (RM)
Terry Pratchett is one of the great authors and his works are eminently quotable. The blog format was used to allow multiple subjects. For quotes by book go to here or character here.