ABSTRACT
Locke's approach to 'belief' and to probability, like his theory of ideas, is complicated by his employment of models which he evidently took to be compatible but which are not easily reconciled with one another. The most fundamental model, from the point of view of his general theory, derived from his conception of 'affirmation' as a mental act of the combination of subject-concept and predicate-concept. It is embodied in the first official definition of 'judgement', as opposed to 'knowledge', to appear in the Essay.
