《文心雕龙·知音》
正确的理解和评论文章虽然困难，遇见能正确理解作者的评论家也不容易；要碰上能彼此理解的人，大概一千年也不过一两人吧！
音实难知，知实难逢，逢其知音，千载其一乎！
It is certainly difficult to rightly understand and comment on a book; it is also difficult to meet with a critic who rightly understands the writer; it is very rare that two persons should exactly understand one another, such a thing does not happen more than once or twice in a thousand years.