Cumulative Record. Chapter 28: The Operational Analysis of Psychological Terms. Quote 24

The response “My tooth aches” is partly under the control of a state of affairs to which the speaker alone is able to react, since no one else can establish the required connection with the tooth in question. There is nothing mysterious or metaphysical about this; the simple fact is that each speaker possesses a small but important private world of stimuli. (pp. 419-420)