The concept of the invisible spiritual realm is so often something which is difficult for us to grasp. If we can see, hear, and feel it we can take it on face value that it is a reality. But what about things that are unseen? Scripture speaks about Heaven, hell, angels and Satan which are a part of the invisible spiritual realm. Bible teacher R. C. Sproul helps us glean a better understanding on these and come to a realisation that in fact all four are realities. "I believe that if we are to be consistent Christians, believing all of the Bible rather than portions of it, we must recognize that the supernatural places and beings described on its pages are real. There is an uncompromised supernaturalism at the heart of the Christian worldview, and we must not let the world�s skepticism with regard to these things affect our belief systems. We must trust and affirm that there is much more to reality than meets the eye.� R. C. Sproul