Chapter XX Aphasia
We explain Aphasia as follows: The word φάσις is used in two ways, having a general and a special signification. According to the general signification, it expresses affirmation or negation, as “It is day” or “It is not day”; according to the special signification, it expresses an affirmation only, and negations are not called φάσεις. Now Aphasia is the opposite of φάσις in its general signification, which, as we said, comprises both affirmation and negation. It follows that Aphasia is a condition of mind, according to which we say that we neither affirm nor deny anything. It is evident from this that we do not understand by Aphasia something that inevitably results from the nature of things, but we mean that we now find ourselves in the condition of mind expressed by it in regard to the things that are under investigation. It is necessary to remember that we do not say that we affirm or deny any of those things that are dogmatically stated in regard to the unknown, for we yield assent only to those things which affect our feelings and oblige us to assent to them.