Joke.

Augustine, Calvin and Barth find themselves waiting outside the throne room on the Day of Judgement. Augustine goes in first, and after half an hour comes out and says to the others: 'It was wonderful! I had all the mysteries of sin, grace and salvation explained to me!'
Next, Calvin goes in, comes out an hour later and says to the others: 'It was wonderful! I had all the mysteries of election, predestination and divine sovereignty explained to me!'
Finally, Barth goes in. After two hours, God comes out and says to the others: 'I've still got no idea what he is talking about!'