Westminster Seminary California has posted what is probably my favorite article by Dr. Michael Horton, their J. Gresham Machen professor of apologetics and systematic theology. The title is “Reformed Theology vs. Hyper-Calvinism.” It deals with how Scripture presents passages that relate both concepts. The great contribution of Reformed theology has been to attempt to properly interpret each in the light of the other, allowing, for example, the passages on the sovereignty of God to prevent us from falling off one side into sheer Pelagianism, and the passages on human responsibility from falling off into Hyper-Calvinism.
Many foes of Reformed theology are guilty of mis-characterizing it in terms of what is formally classified as Hyper-Calvinism. They refuse to notice that Calvinists are just as critical of Hyper-Calvinism as moderate Calvinists and Arminians are. This article helps the reader see the difference between the two.