1. Philosophical Aspects
1.1. As a look at everyday usage shows (Language 1), the “language game” (L. Wittgenstein) of doubt is very diverse. One may doubt the truth of a statement, the rightness of a decision to act, the motives of actions, one’s own feelings or those of others, perceptions of meaning, and religious or other beliefs of every kind. Philosophical tradition has taken over the broad claim that the essential meaning of doubt lies in the subjective impos…