I'm not sure why this is on my mind today, but I've a pretty good idea that it's because I just wrote a quick paper on book three, chapter twelve of Augustine's De doctrina Christiana, which reminded me that Augustine was one of those folks that makes me think, Geez. How can somebody have such great ideas, yet have such horrible ideas?
Augustine's idea of biblical interpretation was that no matter how you interpret a figurative selection of scripture, as long as your interpretation promotes love for God and/or love of another, then your interpretation is correct. (I'll ignore his discussions about what is "figurative" and what is not). In fact, Augustine says that once a person comes to the state of loving God, he or she really doesn't even need to read the Bible anymore. In principle, Augustine was a big fan of the love of God. This, and his rather brilliant inversion of rhetorical eloquence from the classical notion of how something was said, into the notion of the meaning of what was said, are two things I like about Augustine. Beyond that, well, I'm not so sure.
Be that as it may, I'll get back on track. Whenever Jesus was asked what the greatest commandment was, he replied that it was to love God with all of one's heart, mind, soul and strength, and that the second was to love one's neighbor as one's self (see, e.g., Mark 12.28ff). This wasn't Jesus' own, original interpretation of Judaism; of the six hundred-some laws at the time, these two were, in fact, numbers one and two, and his quote comes probably from Deuteronomy 6.4 and Leviticus 19.18. Jesus also said that all of the Law and Prophets hang on these two commandments (see Mt 22.36ff). For me personally, what is more meaningful is that when Jesus knew he was going to be arrested (either by divine foreknowledge or simply because he was bright and saw the writing on the wall; take your pick), his final instruction to his disciples was to love one another (Jn 13.34, 15.12 and surrounding context). I consider this in the following way: when Jesus was about to face trial, and knew either that he was going to be executed or might well be executed, he had one last chance to leave his teaching with those closest to him. How did he do that? He distilled it down to its essence: love one another.
I don't believe that there is much of Christendom that would deny this. I tend to believe that any serious Christian is able to quote these two commandments. I tend to believe that Christendom is mostly united on this intellectual point. But here's the rub: what does it mean to love God with our whole being, and what does it mean to love others as our self? What is it like to love in this way? What does it lead us to be, and how does it call us to live? It is at this point that things get very, very grey, the flywheel goes crazy, and things start coming apart at the axle.
But, I think this is still the best starting point for those of us who want to be Christians in a devoted way. If a person is serious about living a Christian life, it seems to me that the best place for him or her to start is by asking, "What does it mean, what does it really mean, to love God, to really love God, with all of my heart, mind, soul and strength? And, what does it mean, what does it really mean, to love others as myself?" These are the questions that define a life.
I'll end with something I've said before, and will say again: the Jesus story, to the extent that it has been rejected by some, has not been rejected primarily on grounds of historicity. It is the enormous challenge posed by the immense depth of the love espoused by Jesus, rather than any intellectual debate, that has caused serious emphasis upon his story to often be viewed with great skepticism. Jesus called us to accept more than we are willing to accept, to reject more than we are willing to reject, to love more than we are willing to love, and to give more than we are willing to give. Jesus called us to live within the reign and rule of God, and we are typically unwilling to do so. This is why people like you and me killed him in the first place. And, it is no great surprise that we are still murdering him today, in ways both small and large. The culpability falls upon many, many of us—but perhaps most of all upon those of us who are religious, and who, like those before us, continue to crucify Jesus in the name of our human doctrines.