Something that interests me a great deal are all the nifty little biblical references Milton employs in his lines. He adds them in almost casually, and it's easy for me at least to just read through them and not try to understand the allusions he's making. However, they're pretty cool, and one in particular caught my attention.
I hadn't heard of Siloa's Brook before, and "flowed fast by the oracle of God" was just more confusing, so I did a wee bit of research. There's a paper from the University of North Carolina Press titled "Siloa's Brook, the Pool of Siloam, and Milton's Muse" that shed some light on the subject. The authors point out that Isaiah 8:6 references the "waters of Shiloah," and that the body of water "corresponds to the dark-colored spring of the classical muses." They go on to discuss how, if the type of body of water is temporarily ignored, this may also reference the pool at which Christ healed the blind man, the account of which can be found in St John 9.
I think it's interesting how we can see Milton once again fusing classical pagan culture with Christianity, merging his Muse with a miracle of Christ. It will be interesting to see how this pops again in the rest of Paradise Lost, as I'm quite sure it will.
For anyone interested, you can find the paper here, though it is on JSTOR and you will need to log in to read the full text.