St. Augustine of Hippo (354-430) was one of the most prolific geniuses that humanity has ever known, and is admired not only for the number of his works, but also for the variety of subjects, which traverse the whole realm of thought. The form in which he casts his work exercises a very powerful attraction on the reader. Bardenhewer praises his extraordinary suppleness of expression and his marvelous gift of describing interior things, of painting the various states of the soul and the facts of the spiritual world. His latinity bears the stamp of his age. In general, his style is noble and chaste; but, says the same author, "in his sermons and other popular writings he purposely drops to the language of the people." (From the Catholic Encyclopedia)
Pope John Paul II's Apostolic Letter to the bishops, priests, religious families and faithful of the whole Catholic Church on the occasion of the 16th centenary of the conversion of St. Augustine, Bishop and Doctor, August 28, 1986.