The Dilemma of Erenaeus

Erenaeus denies that men can know everything and gives examples of questions that lie beyond our can. We can make only plausible guesses as to what makes the Nile River rise, or what causes rain and other kinds of weather. At a more exalted level, how can humans know what was God doing before he created the world? Later, Augustine will raise this same question and be unable to resist quoting a joke answer he's heard.