Plato used the dialogue format because the exchange of views, the posing and answering of questions, showed that understanding is a living, dynamic process. He distrusted writing because the settled character of the written word makes it look as if truth can be fixed and made to stand still. It is worth remembering that this greatest advocate of the objective reality of truth also believed that our access to that truth was sustained in reasoned discussion.
John Churchill, 1st Duke of Marlborough