The Jews could not bear to hear the truth that they must abide in the Word of Christ, that they must commit to it for the sake of life and freedom.
They wanted, as so many do in our time, to believe that they were fine as they were, that their religion and morality elevated them to being worthy of heaven.
They could not bear to hear anything that challenged their notions of righteousness.
And so, tragically, they are, Jesus says, not children of Abraham in any meaningful sense, and are not children of God in any sense, but rather are children of the devil, the murderer and liar.
There is, as it turns out, a strong family resemblance between the devil and his offspring.