الوجدانيات
States one finds immediately within oneself.
Hunger, thirst, pleasure, pain, joy, sorrow, and fear are not simply coloured shapes seen by the eyes. A person experiences them inwardly; visible signs may accompany them, but the inward state itself is not identical with those signs.
The source distinguishes such states from ordinary objects of the five external senses. At the same time, they are not merely abstract deductions, for the person directly experiences them. That immediate inward character marks the class.