The freethinker frequently says that Jesus of Nazareth was a man of his time, even if he was in advance of his time; and that we cannot accept his ethics as final for humanity. The freethinker then goes on to criticise his ethics, saying plausibly enough that men cannot turn the other cheek, or that they must take thought for the morrow, or that the self-denial is too ascetic or the monogamy too severe. But the Zealots and the Legionaries did not turn the other cheek any more than we do, if so much. The Jewish traders and Roman tax-gatherers took thought for the morrow as much as we, if not more. We cannot pretend to be abandoning the morality of the past for one more suited to the present. It is certainly not the morality of another age, but it might be of another world.
In short, we can say that these ideals are impossible in themselves. Exactly what we cannot say is that they are impossible for us. They are rather notably marked by a mysticism which, if it be a sort of madness, would always have struck the same sort of people as mad. Take, for instance, the case of marriage and the relations of the sexes. It might very well have been true that a Galilean teacher taught things natural to a Galilean environment; but it is not. It might rationally be expected that a man in the time of Tiberius would have advanced a view conditioned by the time of Tiberius; but he did not. What he advanced was something quite different; something very difficult; but something no more difficult now than it was then. When, for instance, Mahomet made his polygamous compromise we may reasonably say that it was conditioned by a polygamous society. When he allowed a man four wives he was really doing something suited to the circumstances, which might have been less suited to other circumstances. Nobody will pretend that the four wives were like the four winds, something seemingly a part of the order of nature; nobody will say that the figure four was written for ever in stars upon the sky. But neither will anyone say that the figure four is an inconceivable ideal; that it is beyond the power of the mind of man to count up to four; or to count the number of his wives and see whether it amounts to four. It is a practical compromise carrying with it the character of a particular society. If Mahomet had been born in Acton in the nineteenth century, we may well doubt whether he would instantly have filled that suburb with harems of four wives apiece. As he was born in Arabia in the sixth century, he did in his conjugal arrangements suggest the conditions of Arabia in the sixth century. But Christ in his view of marriage does not in the least suggest the conditions of Palestine of the first century. He does not suggest anything at all, except the sacramental view of marriage as developed long afterwards by the Catholic Church. It was quite as difficult for people then as for people now. It was much more puzzling to people then than to people now. Jews and Romans and Greeks did not believe, and did not even understand enough to disbelieve, the mystical idea that the man and the woman had become one sacramental substance. We may think it an incredible or impossible ideal; but we cannot think it any more incredible or impossible than they would have thought it. In other words, whatever else is true, it is not true that the controversy has been altered by time. Whatever else is true, it is emphatically not true that the ideas of Jesus of Nazareth were suitable to his time, but are no longer suitable to our time. Exactly how suitable they were to his time is perhaps suggested in the end of his story.
— The Everlasting Man (1925).