Then shall his brother's wife come unto him in the presence of the elders, and loose his shoe from off his foot, and spit in his face, and shall answer and say, So shall it be done unto that man that will not build up his brother's house.
All Commentaries on Deuteronomy 25:9 Go To Deuteronomy 25
Augustine of Hippo
AD 430
The role of holy women was different in the times of the prophets. Obedience, not concupiscence, impelled women to marry for the propagation of the people of God, among whom the forerunners of Christ were sent in advance. For this people, by the things that happened to them as a type, whether they recognized these types or not, were indeed prophetic of Christ, from whom Christ was to take flesh. Hence, in order that this race might be multiplied, the man who did not raise up seed in Israel was held accursed by sentence of the law. That is why holy women were animated by the pious desire of offspring rather than by desire. We may rightly believe that they would not have sought the marriage union if children could have been obtained in any other way.