50th anniversary of Paul VI's encyclical defending transubstantiation

A good one from Guy Noir:

Somewhere Alice von Hildebrand wrote that Humane Vitae was the glory of Paul VI's pontificate. Pope Paul VI remains in my mind an enigma. But that aside, I respectfully differ with Dr. v H. I think this encyclical (Mysterium Fidei), issued when it was and being as explicit as it is, and his Credo can be presented as possibly having equal if not more fundamental significance.

See: Benedict Constable, "50th Anniversary of Paul VI’s Encyclical Mysterium Fidei" (RC, September 3, 2015).