"I have come to believe that a great teacher is a great artist and that there are as few as there are any other great artists. Teaching might even be the greatest of the arts since the medium is the human mind and spirit."

过去不过是一种幻觉，但它是一种必要的幻觉。

在面向听众讲话时，将目光固定在几个人身上比将目光 "扫射 "到整个房间更好。你的眼睛会向别人传达你是否相信自己说的话。