If we do not pay attention to the whole of biblical truth as a system, we become doctrinally one-sided, and doctrinal one-sidedness is bound to issue in spiritual one-sidedness. As human beings we are naturally inclined to be one-sided. One tends to be intellectualistic, another tends to be emotional, and still another tends to be activistic. One tends to be only prophet, another only priest, and a third only king. We should be all these at once and in harmony. A study of systematic theology will help us keep and develop our spiritual balance. It enables us to avoid paying attention only to that which, by virtue of our temperament, appeals to us.
— Cornelius Van Til, Introduction to Systematic Theology, 5.