It is a commonplace of hagiography to extol the saint whom one is writing about to such an extent that the saint is turned into something almost but not quite human. There are, for example, various lives of saints which record the various miracles the saint performed while still an infant, including healings, preachings, and conversions performed while the saint before the average person would even be able to utter a meaningful sound or take a single step. There are the accounts of saints having conversations with animals, of saints transcending the laws of nature, and of saints evincing such love and courage in the face of dire circumstances that everyone for hundreds of miles around is converted to faith in Christ. And then there is St. Augustine and his Confessions.
As the most influential figure of the Western Church perhaps in all of history, Augustine would, no doubt, have been the victim of these mythologized and eulogized hagiographies to which so many other important saints have been subject. He, however, did the work himself of ensuring that we remember him as the deeply flawed and altogether normal human being that he was.
As Augustine traces his life, inner and outer, from infancy to adulthood to conversion to Christianity, the reader is allowed an insight into a man much like himself. What we see is a man driven by lust and tossed about by doubt. What we see, in short, is a man — a real, living human being like ourselves who shared in the same passions in which we share. And who, through the grace of God, conquered them all and became one of the greatest saints of the Christian Church.
If St. Augustine can be a saint, anyone can be saint. And that, in short, is what makes The Confessions one of the greatest of the Great Books.