I shall begin by asking what marriage is; and the mere question will probably reveal that the act itself, good or bad, wise or foolish, is of a certain kind; that it is not an inquiry or an experiment or an accident; it may probably dawn on us that it is a promise. It can be more fully defined by saying it is a vow.
Many will immediately answer that it is a rash vow. I am content for the moment to reply that all vows are rash vows. I am not now defending but defining vows; I am pointing out that this is a discussion about vows; first, of whether there ought to be vows; and second, of what vows ought to be. Ought a man to break a promise? Ought a man to make a promise? These are philosophic questions; but the philosophic peculiarity of divorce and re-marriage, as compared with free love and no marriage, is that a man breaks and makes a promise at the same moment.
The vow is a violent and unique thing; though there have been many besides the marriage vow; vows of chivalry, vows of poverty, vows of celibacy, pagan as well as Christian. But modern fashion has rather fallen out of the habit; and men miss the type for the lack of the parallels. The shortest way of putting the problem is to ask whether being free includes being free to bind oneself. For the vow is a tryst with oneself.
— The Superstition of Divorce (1920).