We have recently been watching and discussing R.C. Sproul's video series Chosen by God in one of our Sunday School classes. Naturally, though our church is "Calvinist" in its confession, this has not always been easy for everyone to grab hold of. Everything in our culture and, for many, our upbringing, screams against a God who is that sovereign. Well, Mike Horton has recently written a book called For Calvinism. (You can buy the book at wtsbooks.com for $10.86, or get the Kindle version for $3.79 from Amazon). Interestingly the foreword is by Roger Olson, a friend of Horton's and a committed Arminian (who in turn earlier wrote a book, Against Calvinism).
So far I have only read the introduction and the foreword, but even that much has been very worthwhile. Incidentally, "Calvinism" is not anyone's favorite way to refer to this, including Horton. Much better is simply to call what Calvin (and Augustine and Paul before him) taught "the doctrines of grace."
Now you might think this is for theological eggheads only. I encourage you to read Horton's introduction (you may even be able to do that online without reading the book :)). I think many Christians (and non-Christians) may think that all that we need to do is just be good people. History has shown, however, that cultural "goodness" is something that cannot be passed on apart from a deeper understanding of God--and without reflecting on what his Word teaches. And that, even a cursory glance of the Bible shows, is more than superficial goodness. So go on--read it!