I’d like to illustrate an interesting distinction between the concept (abstraction) and the percept (the referent actually perceived). The rationalist is more inclined to define reality in terms of the concept and thus may readily be able to transpose his knowledge across space and time. The empiricist is defining reality based on his perceptions. According to the principles of logic, a proper definition is intensional (at the conceptual level) and not extensional (perceptual). This is significant because empirical (extensional) definitions can lead to the assumption that affective and social reality are objective and universal.