What Happened before the Big Bang? - Inflation with Alan Guth

From 1 minute to 2.30s minutes Alan Guth (June 2014) says: what existed before the big bang? Answer - Who knows?! We really have no idea what came before the big bang. That space and time came into existence at the big bang (ie appearance out of nothing) is a possibility but its something you should NOT bet on, because we don't have any way of knowing! In the picture of Eternal Inflation, our big bang was just one event, in a larger picture - it was not really the beginning of anything in the absolute sense.

At 2.30m Guth says Inflation is (possibly) the bang in the big bang.