Here is the correspondence to prove the claim (PDF), just click the image to download.
Or see the discussion here:
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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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