WHEN IT COMES TO THE DOCTRINE OF THE TRINITY , EVANGELICALS HAVE UNDERACHIEVED In The Holy Trinity Robert Letham helps to redress this shortcoming . He offer a well - researched volume about " the One who is utterly transcendent and incomprehensible . " After examining the doctrine's biblical foundations , the author traces its historical development through the twentieth century , and engages four critical issues : the Trinity and ( 1 ) the incarnation , ( 2 ) worship and prayer , ( 3 ) creation and missions , and ( 4 ) persons . " In this outstanding work , Letham points us back to God in all the mystery and glory of his triune being . With his keen theological acumen , Letham has given us a tour de force of Reformed theology . " SINCLAIR B. FERGUSON " Solid and judicious , comprehensive and thorough , abreast of past wisdom and present - day debate , and doxological in tone throughout , this is far and away the best big textbook on the Trinity that you can find , and it will surely remain so for many years to come . " - J. I. PACKER " A comprehensive guide that will stand us all in good stead . Writing from a clearly Reformed position , Letham takes all sides of the question into account , and seeks a way forward on controversial matters that will embrace many different insights in a coherently biblical whole . Teachers and students will rejoice in his clear presentation of the issues involved . " GERALD BRAY