We republish the words of Bergoglio, without comment, as their meaning is obvious:
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The Book on the Trinity, every faithful Catholic priest would love as his next present
This is Br. Bugnolo's English Translation, of Saint Bonaventure's encylopedic book of theology on the Trinity: With this book, your priest will always have something intelligent and awesomely inspiring to preach to you about
God the Father, God the Son & God the Holy Spirit!
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The significance of this affirmation by Bergoglio can be see if one reads
https://fromrome.wordpress.com/2018/11/19/the-validity-of-pope-benedict-vxis-resignation-must-be-questioned/