如果尚未对最慢的男人形成任何想法，可以向最慢的男人解释。但是，如果最聪明的人坚定地说服了他已经知道，毫无疑问地说，最简单的事情就无法清楚地说明他在他面前所说的一切。 -Leo Tolstoy，1897年
(The most difficult subjects can be explained to the most slow-witted man if he has not formed any idea of them already; but the simplest thing cannot be made clear to the most intelligent man if he is firmly persuaded that he knows already, without a shadow of doubt, what is laid before him. -Leo Tolstoy, 1897)