Becket was a type of those historic times in which it is really very practical to be impracticable. The quarrel which tore him from his friend’s side cannot be appreciated in the light of those legal and constitutional debates which the misfortunes of the seventeenth century have made so much of in more recent history. To convict St. Thomas of illegality and clerical intrigue, when he set the law of the Church against that of the State, is about as adequate as to convict St. Francis of bad heraldry when he said he was the brother of the sun and moon. There may have been heralds stupid enough to say so even in that much more logical age, but it is no sufficient way of dealing with visions or with revolutions. St. Thomas of Canterbury was a great visionary and a great revolutionist, but so far as England was concerned his revolution failed and his vision was not fulfilled. We are therefore told in the text-books little more than that he wrangled with the King about certain regulations; the most crucial being whether “criminous clerks” should be punished by the State or the Church. And this was indeed the chief text of the dispute; but to realise it we must reiterate what is hardest for modern England to understand—the nature of the Catholic Church when it was itself a government, and the permanent sense in which it was itself a revolution.
It is always the first fact that escapes notice; and the first fact about the Church was that it created a machinery of pardon, where the State could only work with a machinery of punishment. It claimed to be a divine detective who helped the criminal to escape by a plea of guilty. It was, therefore, in the very nature of the institution, that when it did punish materially it punished more lightly. If any modern man were put back in the Becket quarrel, his sympathies would certainly be torn in two; for if the King’s scheme was the more rational, the Archbishop’s was the more humane. And despite the horrors that darkened religious disputes long afterwards, this character was certainly in the bulk the historic character of Church government. It is admitted, for instance, that things like eviction, or the harsh treatment of tenants, was practically unknown wherever the Church was landlord. The principle lingered into more evil days in the form by which the Church authorities handed over culprits to the secular arm to be killed, even for religious offences. In modern romances this is treated as a mere hypocrisy; but the man who treats every human inconsistency as a hypocrisy is himself a hypocrite about his own inconsistencies.
— A Short History of England (1917).