"Since love of God is the highest felicity and happiness of man, his final end and the aim of all his actions, it follows that he alone observes the divine law who is concerned to love God not from fear of punishment nor love of something else, such as pleasure, fame, ect., but from the single fact that he knows God, or that he knows that the knowledge and love of God is the highest good". (pg 60)
Spinoza's Theological-Politcal Treasise has intrigued me for a while, here was one of the earlier books to approach the bible as fallible and openly raise questions which would later be the subject of much later biblical debate, such as the authorship of the Pentateuch. Since this was one of the first books like this, written in a time when freedom of speech wasn't a given, the book is a little uneven. During parts Spinoza tries to reinterpret scripture using scripture which seems to give authority to scripture, while in other parts he tries to show how scripture is a product of man and not God. My guess is that while he's trying to decrease the reliance on scripture for discovering god, he also wants to take care not to offend those people. In the end it slightly backfired, for a while he was thought of as an atheist and his book was banned, although now days the book's influence on historical criticism is felt.
A large chunk of the book Spinoza seems to try to take the supernatural elements out of the bible. To him things such as ten plagues in Egypt can easily be explained with natural causes, for example the locusts came by a wind from the east or a natural cause. If these things can be explained by natural causes, then its likely that the harder to explain things also likely happened with natural causes (although I don't remember him trying to explain away the virgin birth, but that might have been too dangerous). Furthermore he believes that god established the natural laws, and if god were to bend them at all to perform a miracle then that would in fact mean that he made a mistake establishing the laws.
The political part of the book is much smaller, its takes up the last few chapters, although the entire book is leading up to this point. Spinoza has been tearing down the inerrancy of the bible for the purpose of trying to get the government to allow freedom of speech and to philosophize, perhaps if the bible isn't so divine then people won't feel the urge to silence anyone who disagree with it. This freedom and a democracy leads to a more happy individual and state.
On a side note, I read this with the Cambridge edition, I've been really pleased with the two books I've bought so far from the series. They seem to have high quality acid-free paper which will last for a while and contain great introductions, easy to read translations and have plenty of footnotes. I've been getting more things on the Kindle, but this series is one I'll continue to get paper copies of.