《文心雕龙·指瑕》
文章写作的基本途径，不外用字和立义两个方面：用字要根据正确的解释来确定含义，立义要通过正确的道理来阐明。
若夫立文之道，惟字与义。字以训正，义以理宣。
Basically, there are only two basic ways of writing an article: using words and establishing meaning. Using words requires using correct explanations to determine meaning, and establishing meaning requires using correct reasoning to explain it.