The above verse, written some six hundred years before the birth of Christ, is quoted frequently in the New Testament, and became the rallying cry and theme of the Reformation after a Roman Catholic Priest named Martin Luther found it quoted in the New Testament letter to the Romans and realized it was the central point of religion itself, most particularly the Christian religion.
Write me
if you'd like to discuss that in more detail, but the following
are some good sources for information and reference on Reformed
Christianity.
Jonathan Barlow's explanation of Calvinism concisely explains the "Five Points" upon which Reformed Christianity rests.
Calvin's Commentaries offer a more in-depth study of the Bible from a Reformed perspective.
The Center for Reformed Theology and Apologetics and the Christian Classics Ethereal Library each bring together a wide assortment of Christian and Reformed commentaries, studies, and fiction.
Cornerstone United Reformed Church offers both web links and personal replies to theological questions.