Whether a husband could lawfully take back the wife he had divorced?

Objections

Objection 1 : It would seem that a husband could lawfully take back the wife he had divorced. For it is lawful to undo what was ill done. But for the husband to divorce his wife was ill done. Therefore it was lawful for him to undo it, by taking back his wife.
Objection 2 : Further, it has always been lawful to be indulgent to the sinner, because this is a moral precept, which obtains in every law. Now the husband by taking back the wife he had divorced was indulgent to one who had sinned. Therefore this also was lawful.
Objection 3 : Further, the reason given (Dt. 24:4) for its being unlawful to take back a divorced wife was "because she is defiled." But the divorced wife is not defiled except by marrying another husband. Therefore at least it was lawful to take back a divorced wife before she married again.