Hence it makes our cognitive faculties its sole concern, to the exclusion of the feeling of pleasure or displeasure and the faculty of desire; and among the cognitive faculties it confines its attention to the understanding and its a priori principles, to the exclusion of judgement and reason, (faculties that also belong to theoretical cognition,) because it turns out in the sequel that there is no cognitive faculty other than understanding capable of affording constitutive a priori principles of knowledge.