 Grice’s views on everyday psychological explanation are intertwined with his views on rationality. Grice contends that the right picture of rationality is the picture, given us by Plato and Aristotle and others, as something which essentially functions to regulate, direct, and control pre-rational impulses, inclinations, and dispositions. Both everyday psychological explanation and assessments of rationality employ commonsense psychological principles. By such principles we mean a relatively stable body of generally-accepted principles, of which the following are examples: