' Ruben Angelici has used the Sources chrétiennes Latin text of G. Salet, and has provided an extensive introduction and commentary. [...] He has endeavoured to offer 'as literal a translation... as possible, without appearing pedantic.' An English translation has long been needed and the present version is welcome for that reason. ' G. R. Evans in Journal of Theological Studies, Vol. 63 (2), October 2012 '[Richard of St Victor's] writing is assured as he sets out an ambitious and systematic statement of why we affirm the nature of God as Trinity. [...] Scholars of this period will be grateful for the first English translation of this important work, while those less familiar with it will find that it helps them to enter into the thinking and culture of a different age.' The Revd Dr John Binns, Church Times, 21/28 December, 2012 "...Now, thankfully, we can set those momentous reflections in context with the whole work- its theological foundations and implications, because Angelici has offered a much needed, complete edition of this important work along with helpful commentary and referencing. Perhaps now, the legacy of the Abbey of St Victor will be more widely known and celebrated..." Taylor Worley, Theological book review, Vol. 24, No 2, 2012. '... all theologians are in Angelici's debt.' Stephen H. Webb, Reviews in Religion and Theology, Vol.21, No.1, January 2014