This book is a great example of rational thinking. The way Paley states his argument is flawless, and he uses all the resources available by his time. His arguments, of course, are no longer useful to creationists, this book was written way before Darwin and Wallace structure their theory, but at his time this was a must read. Even Darwin and Wallace read the book lots of years later, when they were students, and this book imprint (at least as I'm concern) a great prejudice Darwin had to surpass to establish his theory. It is so well written, and, again, so well founded, that dismiss it was quite a task. Recently Dawkins wrote a book "The blind Watchmaker" that was inspired by Paley's "Natural Theology", and solidly refutes his arguments (irrefutable in Paley's time, since no scientific evidence or theory had been powerfully establish as to do so). This is a classic book, it is incredibly interesting from a lot of different perspectives, I highly recommend it.