In Jesus' Kingdom the master sends his servants repeatedly to the tenders of his vineyards to prophesy and each time the tenders kill the servants. Finally, the master sends his son to prophesy and they kill him too. But then the master comes and reigns vengeance on those wicked tenders.
I think this illustrates a point. In 1 Samuel 15.11 God says, "'I regret that I have made Saul king, for he has turned back from following me and has not performed my commandments." But then in 15.28-29 Samuel says to Saul, “The LORD has torn the kingdom of Israel from you this day and has given it to a neighbor of yours, who is better than you. And also the Glory of Israel will not lie or have regret, for he is not a man, that he should have regret.” So what gives? I think the point is that while God regrets the sinful actions of the wicked, he will not have regret. That is, he will not live with regret. The Lord will make things right. He will make a wicked king prophesy, and he will vindicate his murdered Son. The Lord may regret the sinfulness of those who act wickedly, but he will not abide regret. He will set things right, doing justice and vindicating the righteous.