'Suppose someone should be caught in the act of adultery and the foulest crimes and then be thrown into prison. Suppose, next, that judgment was going to be passed against him and that he would be condemned. Suppose that just at that moment a letter should come from the Emperor setting free from any accounting or examination all those detained in prison. If the prisoner should refuse to take advantage of the pardon, remain obstinate and choose to be brought to trial, to give an account, and to undergo punishment, he will not be able thereafter to avail himself of the Emperor's favor. For when he made himself accountable to the court, examination, and sentence, he chose of his own accord to deprive himself of the imperial gift. This is what happened in the case of the Jews. Look how it is. All human nature was taken in the foulest evils. "All have sinned," says Paul. They were locked, as it were, in a prison by the curse of their transgression of the Law. The sentence of the judge was going to be passed against them. A letter from the King came down from heaven. Rather, the King himself came. Without examination, without exacting an account, he set all men free from the chains of their sins. All, then, who run to Christ are saved by his grace and profit from his gift. But those who wish to find justification from the Law will also fall from grace. They will not be able to enjoy the King's loving-kindness because they are striving to gain salvation by their own efforts; they will draw down on themselves the curse of the Law because by the works of the Law no flesh will find justification.'
From 'Discourses Against Judaizing Christians' I:6-II:1.