The scientific man will next distinguish the faculties with which the investigating is to be done, according to the respective realms. That this classification is required by the fundamental difference in the nature of the truths in these two realms is so self-evident that it ought to be axiomatic to all who think with any degree of scientific accuracy. For in the nature of things, =natural= truth requires investigation by =intellectual= faculties, and =spiritual= truth by =spiritual= faculties. Indeed, this distinction is fully recognized when science halts its pursuit of truth at the boundary line of the spiritual realm. Yet, although this classification is theoretically recognized by science, and although it is absolutely demanded if we are to proceed scientifically in our researches in the spiritual realm, it is little less than amazing how many there are who utterly fail to distinguish these faculties when they start out to investigate spiritual truth. Indeed, this is the first place where the Church and the Schools part company. For the whole attitude of our Schools today, including most of the institutions founded and fostered by the Church, seems to be one that entirely misses the scientific necessity of distinguishing between these essentially different faculties when working in these two utterly divergent realms of truth. And so it comes to pass that while the Church is using one sort of faculties, the Schools are using another kind on the same class of truth. It needs scarcely to be argued that the =intellect=, with its capacity to =reason=, is the proper faculty of apprehension in the scientific realm. But it is equally true that the =heart=, with its capacity to =believe=, is the one faculty of apprehension in the spiritual realm. That is, the inquirer reasons his way to knowledge in the natural realm, and believes his way to knowledge in the spiritual realm. He uses his mind in order to understand what God has done in His creation, and he exercises faith in order to come into the knowledge of what He is in His character. In natural things he believes because he understands, and in spiritual things he understands because he believes. In drawing this contrast between mind and heart, however, it is fully recognized that the term "heart," in much if not all of Scripture, stands for the whole personality, including intellect, emotion and will. But it is also a fact that this term stands for that certain =attitude= of the whole personality toward God through His Word in which one believes and receives His Word without question, even though it may not be understood, rather than insisting on understanding it in order to believe it.