世界的眼泪是恒定的。每当一个人开始哭泣，另一个地方就有一个人停止哭泣。笑声也是如此。
The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.
音乐是一种人人都能理解的通用语言。
Give the pupils something to do, not something to learn; and the doing is of such a nature as to demand thinking; learning naturally results.