The post title says, in Latin, “He could do it, it was fitting, so he did it”. The “he” in question is God. The “it” is the Immaculate Conception.
God could make his mother immaculate; it was fitting that he should do so; so he did so.
This is the concise way that Franciscans in the 13th century formulated an explanation of this dogma. Not that it says everything. But it says a lot.
This Solemnity of December 8 is a Holy Day of Obligation, one of the few that does not get absorbed into a nearby Sunday. So be sure to get to Mass! It is also the Patronal Feast Day of the United States of America. In fact, the Bishops of this country chose Mary Immaculate as our patron on May 13, 1846 – several years before the Dogma of the Immaculate Conception was defined by Bl. Pope Pius IX. You can read that history here.
May the Immaculate Mother of God intercede for our nation and help us to clean up our act! Mary Immaculate, pray for your country, the United States of America!