《文心雕龙·颂赞》
颂是本着颂扬的基本要求来敷陈文采，从广义的意义上来确立内容。至于细致巧妙的描写，也必须根据实际情况采取变通。颂的写作，大致就是这样了。 赞 的意思就是说明，就是辅助。
及益赞于禹，伊陟赞于巫咸，并扬言以明事，嗟叹以助辞也。故汉置鸿胪，以唱言为赞，即古之遗语也。
Song is based on the basic requirements of eulogy to present literary style, and establishes its content from a broad sense. As for the detailed and ingenious description, it is also necessary to adopt flexibility based on the actual situation. This is roughly how a eulogy is written. Zan means to explain, that is, to assist.