Using biblical texts, it attempts to compare and relate all of scripture which led to the creation of a systematized statement on what the whole Bible says about particular issues.
Even with such diversity, it is generally the case that works that one can describe as systematic theologies begin with revelation and conclude with eschatology.
Since it is a systemic approach, systematic theology organizes truth under different headings[1] and there are certain basic areas (or categories), although the exact list may vary slightly.
These are:[9] The establishment and integration of varied Christian ideas and Christianity-related notions, including diverse topics and themes of the Bible, in a single, coherent and well-ordered presentation is a relatively late development.
Similarly, William Ames's systematic treatise, The Marrow of Theology (1629), would become the standard textbook for Harvard and Yale in their nascent years.
Significant for this period, Friedrich Daniel Ernst Schleiermacher's Der christliche Glaube nach den Grundsätzen der evangelischen Kirche (The Christian Faith According to the Principles of the Protestant Church [1821-1822]) espoused the fundamental idea of a universal presence among humanity, sometimes more hidden, sometimes more explicit, of a feeling or awareness of 'absolute dependence,' and this became a focal point of either acceptation, integration, or rejection among theologians.
[15] Systematic theology likewise saw a great variety of development into the 20th century, most notably with the advancement of Neo-Orthodoxy and the multivolume Church Dogmatics of Karl Barth.
As such, the variety and perspectives of systematic theology in the 20th century has tracked well with both the broadening of ethical concerns post-World War II, its expansive pluralism, and the advent of postmodernism.