_Intellectual Development of Man_.--Some philosophers have succeeded in recounting human progress by tracing the intellectual development of the race. This is possible, for everything of value that has been done, and which has left a record, bears the mark of man's intellect. In the early period of his existence, man had sufficient intellect to direct his efforts to satisfy the common wants of life. This exercise of the intellectual faculty has accompanied man's every movement, but it is best observed in the products of his industry and the practice of social order. By doing and making, the intellect grows, and it is only by observing the phenomena of active life that we get a hint or trace of the powers and capacities of the mind. {48} But after man begins the process of reflective thinking, his intellectual activities become stronger, and it is much easier to trace his development by considering the condition of religion, law, philosophy, literature, sculpture, art, and architecture. These represent the best products of the mind, and it is along this intellectual highway that the best results of civilization are found. During the modern period of progressive life systematic education has forced the intellectual faculties through a more rapid course, giving predominance to intellectual life everywhere. The intellectual development of nations or the intellectual development of man in general is a theme of never-tiring interest, as it represents his noblest achievements. Man from the very beginning has had a desire for knowledge, to satisfy curiosity. Gradually, however, he had a desire to know in order to increase utility, and finally he reaches the highest state of progress in desiring to know for the sake of knowing. Thus he proceeds from mere animal curiosity to the idealistic state of discovering "truth for truth's sake." These are qualities not only of the individual in his development but of the racial group and, indeed, in a larger way of all mankind; intelligence developed in the attempt of man to discover the nature of the results of his instinctive, impulsive, or emotional actions. Later he sought causes of these results. Here we have involved increased knowledge as a basis of human action and the use of that knowledge through discriminating intelligence. The intellect thus represents the selective and directive process in the use of knowledge. Hence, intelligent behavior of the individual or of the group comes only after accumulated knowledge based on experience. The process of trial and error thus gives rise to reflective thinking. It is a superior use of the intellect that more than anything else distinguishes the adult from the child or modern man from the primitive.