Whether husband and wife can take a vow contrary to the marriage debt without their mutual consent?

❌ Objection 1 : It would seem that husband and wife may take a vow contrary to the marriage debt without their mutual consent. For husband and wife are equally bound to pay the debt, as stated above (Article [5]). Now it is lawful for the husband, even if his wife be unwilling, to take the cross in defense of the Holy Land: and consequently this is also lawful to the wife. Therefore, since this prevents the payment of the debt, either husband or wife may without the other's consent take the aforesaid vow.

❌ Objection 2 : Further, in taking a vow one should not await the consent of another who cannot dissent without sin. Now the husband or wife cannot, without sin, refuse their consent to the other's taking a vow of continence whether absolutely or for a time; because to prevent a person's spiritual progress is a sin against the Holy Ghost. Therefore the one can take a vow of continence either absolutely or for a time, without the other's consent.

❌ Objection 3 : Further, in the marriage act, the debt has to be demanded just as it has to be paid. Now the one can, without the other's consent, vow not to demand the debt, since in this he is within his own rights. Therefore he can equally take a vow not to pay the debt.

❌ Objection 4 : Further, no one can be bound by the command of a superior to do what he cannot lawfully vow or do simply, since one must not obey in what is unlawful. Now the superior authority might command the husband not to pay the debt to his wife for a time, by occupying him in some service. Therefore he might, of his own accord, do or vow that which would hinder him from paying the debt.