Verbal Behavior: Extended Edition. Chapter 19: Thinking. Quote 23

When a man talks to himself, aloud or silently, he is an excellent listener . . . He speaks the same language or languages and has had the same verbal and nonverbal experience as his listener. He is subject to the same deprivations and aversive stimulations, and these vary from day to day or from moment to moment in the same way. As listener he is ready for his own behavior as speaker at just the right time and is optimally prepared to “understand” what he has said. Very little time is lost in transmission and the behavior may acquire subtle dimensions. It is not surprising, then, that verbal self-stimulation has been regarded as possessing special properties and has even been identified with thinking. (pp. 438-439)