This is a rich source of traditional Christian theology that has found wide acceptance in all quarters of the Christian world. In it John of Damascus produced the first systematic compendium of accepted Christian theology, drawn primarily from the Greek theologians of the fourth and fifth centuries. The author does not argue for any new doctrine but seeks to present a systematic account of Christian dogma, supported by Scripture and rational arguments. In doing so he shows himself to be a very capable theologian. According to the Catholic Encyclopedia, this exposition was translated into Latin in 1150 and was immensely influential. I searched the Summa Theologia of Thomas Aquinas and found the "Damascene" cited 372 times. Calvin, on the other hand, merely mentions him in a footnote. Perhaps Calvin disliked the Damascene's Cyrillian Christology, which differed somewhat from his own. (Calvin does not cite Cyril of Alexandria much either.) Today one finds social Trinitarians citing John of Damascus in support of their views, but a reading of the exposition will make clear that John's view of the Trinity was the traditional unitary view of one tripersonal being, with one will, one power, one rule, etc.
I wish that Amazon had included the bibliographical information. This is not a new translation but simply the 1898 translation of S.D.F. Salmond, which was published in the Nicene and Post-Nicene Fathers.