ABSTRACT
There is more agreement concerning the formulated definition of thought than concerning the other functions. Thought is regarded as the mental activity by means of which the material of perceptions and ideas is elaborated into an objective system. To this end, the material is analysed and synthesized to form a coherent whole, without contradictions, and in conformity with experience. Thinking is expressed in judgments containing constant elements. These judgments are combined to make rules and laws, thus building up a system of knowledge whose aim it is to record the constant element in all happening.
