My aunt and uncle had a vineyard behind their house. It was not very big, but it produced tasty grapes. I really liked them. And while my childhood memory may not be great, I do not remember sour grapes. To be clear, there was care for the grapes that I did not see. They required care. They needed to be tended to in order to be tasty.
I cannot imagine what would have happened if in spite of the hard work there were no grapes to be had. Or, worse, if despite hard work the grapes were sour. And yet that is what we hear in the readings. Despite the loving self-gift of Jesus to save us, we do not always bear good fruit. We turn away. We disrupt. And sometimes even, we kill. The call today is to be the disciple that does not disrupt, but bears fruit.