Yet some commentators have argued for the possibility that married men of proven seriousness and maturity ("viri probati", taking up a phrase which appears in the first-century First Epistle of Clement in a different context) might be ordained to a localized and modified form of the priesthood. The topic of "viri probati" was raised by some participants in discussions at Ordinary General Assembly XI of the Synod of Bishops held at the Vatican in October 2005 on the theme of the Eucharist, but it was rejected as a solution for the insufficiency of priests.