if we decide it to be right to grant our friends whatever they wish, and to ask them for whatever we wish, perfect wisdom must be assumed on both sides if no mischief is to happen. But we cannot assume this perfect wisdom; for we are speaking only of such friends as are ordinarily to be met with, whether we have actually seen them or have been told about them—men, that is to say, of everyday life. I must quote some examples of such persons, taking care to select such as approach nearest to our standard of wisdom.