“[I]n modern language we think of "idiot" as someone who is stupid or a fool. That is not the classical meaning... An idiot is someone who cares only about himself and has no regard for anyone else, and that's terribly important when you think about tyrants. ...[W]e think of tyrants as people who are horrible... oppressors. ...[I]n its classic historic meaning, tyrant was simply someone who ceased power.”