John 8:37

. know, &c. By nature ye are Abraham's children, but in your deeds ye are degenerate. Your descent from Abraham will not therefore profit you. It will increase your damnation, for he will say at the last day, I acknowledge you not as my children, for ye have crucified Christ, my son and your brother.

Because My word, &c. Because ye will not take it in. Origen and S. Chrysostom think that these words were said to those who had before feebly believed in Christ, but who, on hearing themselves called "servants," were incensed against Him and wished to kill Him. But it is more probable that they were addressed to unbelievers who had before that plotted His death.