via Vatican News:

Pope Benedict’s letter was presented by its recipient, Msgr Dario Edoardo Viganò, during a press conference presenting “The Theology of Pope Francis,” a series of 11 books written by 11 different authors, and published by Libreria Editrice Vaticana…

“I applaud this initiative,” writes Pope Benedict. “It contradicts the foolish prejudice of those who see Pope Francis as someone who lacks a particular theological and philosophical formation, while I would have been solely a theorist of theology with little understanding of the concrete lives of today’s Christian.”…

Pope Benedict XVI adds that these volumes “reasonably demonstrate that Pope Francis is a man with profound philosophical and theological formation and are helpful to see the interior continuity between the two pontificates, even with all the differences in style and temperament.”