Matthew 23:31

What kind of accusation is this, to Call one the son of a murderer, who partakes not in his father's disposition? Clearly there is no guilt in being so; wherefore this must be said in proof of their resemblance in wickedness.

What they thought in their hearts, that they spoke by their deeds. Christ lays bare here the natural habit of all wicked men; each readily apprehends the other's fault, but none his own; for in another's case each man has an unprejudiced heart, but in his own case it is distorted. Therefore in the cause of others we can all easily be righteous judges. He only is the truly righteous and wise who is able to judge himself. It follows, Wherefore ye be witnesses unto yourselves, that you are the children of them which killed the Prophets. The character of the parents is a witness to the sons; if the father be good and the mother bad, or the reverse, the children may follow sometimes one, sometimes the other. But when both are the same, it very rarely happens that bad sons spring of good parents, or the reverse, though it be so sometimes. This is as a man is sometimes born out of the rule of nature, having six fingers or no eyes.

For the things that ye now dare to do, show that ye do these things also in this spirit. For, though ye speak the contrary, saith He, as condemning them, as, for instance, "We should not, if we had been in their days, have been partakers with them;" yet the disposition is evident wherewith ye say these things. Wherefore also unfolding it, though darkly, still He hath expressed it. For when He had said, ye say, "If we had been in the days of our fathers, we should not have been partakers with them in the blood of the prophets;" He added, "Wherefore ye be witnesses unto yourselves, that ye are the children of them that slew the prophets." And what blame is it to be a murderer's son, if one partake not in the mind of one's father? None. Whence it is evident, that for this same thing He brings it forward against them, hinting at their affinity in wickedness.

By a most subtle syllogism He proves them to be the sons of murderers, while to gain good character and reputation with the people, they build the sepulchres of the Prophets whom their fathers put to death. Though they speak not this in words, they proclaim it by their actions, in ambitious and magnificent structures to their memory.