A young ungrounded Christian, when he sees all the fundamental truths, and sees good evidence and reasons of them, perhaps may be yet ignorant of the right order and place of every truth. It is a rare thing to have young professors to understand the necessary truths methodically: and this is a very great defect: for a great part of the usefulness and excellency of particular truths consisteth in the respect they have to one another. This therefore will be a very considerable part of your confirmation, and growth in your understandings, to see the body of the Christian doctrine, as it were, at one view, as the several parts of it are united in one perfect frame; and to know what aspect one point has upon another, and which are their due places. There is a great difference betwixt the sight of the several parts of a clock or watch, as they are disjointed and scattered abroad, and the seeing of them conjointed, and in use and motion. To see here a pin and there a wheel, and not know how to set them all together, nor ever see them in their due places, will give but little satisfaction. It is the frame and design of holy doctrine that must be known, and every part should be discerned as it has its particular use to that design, and as it is connected with the other parts.
Some scholars look with suspicion at systematic theology when -or even because -its teachings fit together in a noncontradictory way. They object that the results are "too neat" and that systematic theologians must therefore be squeezing the Bible's teachings into an artificial mold.... this objection is sometimes made by those who -perhaps unconsciously -have adopted from our culture a skeptical view of the possibility of finding universally true conclusions about anything, even about God from his Word.Systematic Theology, 30
we all have areas like that, areas where our understanding of the Bible's teaching is inadequate. In these areas, it is helpful for us to be confronted with the total weight of the teaching of Scripture on that subject, so that we will more readily be persuaded even against our initial wrongful inclinations.Systematic Theology, 28
The basic reason for studying systematic theology, then, is that it enables us to teach ourselves and others what the whole Bible says, thus fulfilling the second part of the Great Commission.Systematic Theology, 28
It was not necessary for the apostles to write a catechism so as to deliver their doctrines professedly. It was enough for them to hand down to us those doctrines in accordance with which all symbolical books and catechisms might be constructed. If they did not formally write a catechism, they did materially leave us either in the gospels or in the epistles those things by which we can be clearly taught the principles of religion (katécheisthai).
This skeptical viewpoint must be rejected by evangelicals who see Scripture as the product of human and divine authorship, and therefore as a collection of writings that teach noncontradictory truths about God and about the universe he created.Systematic Theology, 31
The task of fulfilling the Great Commission includes therefore not only evangelism but also teaching. And the task of teaching all that Jesus commanded us is, in a broad sense, the task of teaching what the whole Bible says to us today. To effectively teach ourselves and to teach others what the whole Bible says, it is necessary to collect and summarize all the Scripture passage son a particular subject.Systematic Theology, 27
"The Bible says that Jesus Christ is the only way to God." "The Bible says that Jesus is coming again." These are all summaries of what Scripture says and, as such, they are systematic theological statements. In fact, every time a Christian says something about what the whole Bible says, he or she is in a sense doing "systematic theology" Systematic Theology, 24
Systematic theology is any study that answers the question, "What does the Bible teach us today?" about any given topic.Systematic Theology, 21 (John Frame cited)