Sarah Coakley defines Systematic Theology
Sarah Coakley, God, Sexuality, and the Self: An Essay ‘On the Trinity’ (Cambridge, 2013), 41:
Systematics, in other words, does not convey the hubristic idea of a totalizing discourse that excludes debate, opposition, or riposte; but on the other hand, it does not falter at the necessary challenge of presenting the gospel afresh in all its ramifications – systematically unfolding the connections of the parts of the vision that is set before us.
In short, it is an integrated presentation of Christian truth, however perceived, that ‘system’ connotates here: wherever one choses to start has implications for the whole, and the parts must fit together. However briefly, or lengthily, it is explicated (and sometimes . . . the shorter versions have been at least as elegant, effective, and enduring as the longer ones), ‘systematic theology’ must attempt to provide a coherent, and alluring, vision of the Christian faith.