sentences:  He was also a notable English-language expositor on the theological and philosophical work of Rudolf Bultmann.Among Macquarrie's most widely read books are "Existentialism", meant as an introduction to the subject, and his major work, "Principles of Christian Theology", a work of systematic theology which aims to harmonise existentialism and orthodox Christian thought.His work is characterised by even-handedness to all sides and viewpoints and, although not always readily accessible to those without a good background in philosophy, his writing is considered engaging and often witty - at least judged by the standards of existentialism and systematic theology.