dcf0706f_Mass__Traditional__Tridentine___Things_to_think_about
Don't skip the homily: the homily, therefore, is to be highly esteemed as part of the liturgy itself; in fact, at those Masses which are celebrated with the assistance of the people on Sundays and feasts of obligation, it should not be omitted except for a serious reason. (Sacrosanctum Concilium 52) [Things to think about] 
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Ordinary Form of the Mass (Novus Ordo, New) compared to the Extraordinary Form of the Mass (Traditional, Tridentine)
Things to think about