ABSTRACT
Mathematical reasoning is regarded as one of highest expressions of the activity because of the universal validity of the conclusions to which it leads. The visible results of reasoning in practical life and the universal esteem for its employment in more abstract channels would appear to justify the position accorded to it in the scheme of activity. While reasoning is exploratory and in this sense leads to a new product it is at the same time rigidly controlled by limitations of material and by relation of time and space. Reasoning in the sphere of human relationships is perhaps the most difficult of all since the relevant considerations are apt to be elusive and have not that quality of stability found in mathematical symbols. In the absence of an encyclopaedia or high authority the investigation of causes of natural phenomena involves us in a train of reasoning activity which brings us into touch with lines of scientific investigation.
