Listen, if these two can hit the big time, there's hope for us all.
Peter was quick-tempered, hot-headed and often got things wrong. He went back on his word in the worst possible way, telling Jesus he would always stand by him, and yet at the first sign of trouble, he ran, terrified, and denied all knowledge of him.
And Paul, or Saul, as he was in the beginning, well, he was the Godfather of the persecutors of Christians. His name struck terror in Christian hearts. He was present at the stoning of Stephen, the first martyr, 'and Saul approved of their killing him'.
And yet God, who doesn't judge by human standards, saw something in both of them that we certainly wouldn't have seen. He said:
'You are Peter (which means rock) and on this rock I will build my church. And the gates of the Underworld will never hold out against it'
And after he'd sorted Saul out by throwing him off his horse and blinding him for a few days, God chose him to take the Gospel beyond the Jews - 'he is an instrument whom I have chosen to bring my name before Gentiles'.
And pretty good at it he turned out to be as well.
So, if you're like me, and think that most of the time you're getting it wrong, look at Peter and Paul. I suppose Paul sums it up here:
'For all of you are the children of God through faith, in Christ Jesus, since every one of you that has been baptised has been clothed in Christ....And simply by being Christ's, you are the progeny of Abraham, the heirs named in the promise'
I think I could get used to this preaching business!