Plato used the word nous in many ways which were not unusual in the everyday Greek of the time, and often simply meant "good sense" or "awareness".[17] On the other hand, in some of his dialogues it is described by key characters in a higher sense, which was apparently already common. In his Philebus 28c he has Socrates say that "all philosophers agree—whereby they really exalt themselves—that mind (nous) is king of heaven and earth. Perhaps they are right." and later states that the ensuing discussion "confirms the utterances of those who declared of old that mind (nous) always rules the universe".[18]