你必须写那本想要被写出来的书。如果这本书对成年人来说太难,那么你就为孩子们写。
You have to write the book that wants to be written. And if the book will be too difficult for grown-ups, then you write it for children.
解释:那些知识浅薄的人所争论的都是些枝微末节。
唯一真正的错误是我们从中一无所获的错误。
The history of mathematics is a history of human curiosity and ingenuity.