Systematic theology is theology that is systematic. It is less narrative, less story, less organic, all key terms in our postmodern age. It is the study of the things of God in a systematic, orderly fashion, where we not only consider what this text says and that text, but where we consider all that the Word says about revelation, then all the Word tells us about who God is, then all that the Word tells us about who Jesus is, and then all that He has done for us. Systematic theology then goes on to consider the doctrine of man, of sin, of sanctification, of the sacraments, the church and the end times. Systematic theology is a way of looking at God’s revelation that strongly affirms the coherency and consistency of all that God reveals. It is an attempt to put all texts in their ultimate context—all other texts.
R.C. Sproul Jr.