Biblical Theology to Systematic
Systematic theology stands one step further removed from the Bible than does biblical theology. Biblical theology attempts to explain synthetically the meaning of the biblical text in continuity with the meaning intended for its original audience, but it extends this meaning through redemptive historical analysis. Systematic theology draws on the Bible directly and on the conclusions of biblical theology to explain questions that are often foreign to the biblical authors and even the canon as a whole, questions which can nonetheless be answered with confidence given the scope of the Bible.
Glenn Butner Jr. The Son Who Learned Obedience: A Theological Case Against the Eternal Submission of the Son (Eugene, OR: Pickwick Publications, 2018), 7-8