"The world is a book, and those who do not travel read only one page."
Every character has a world inside them, if you look closely enough.
凡事天下要考察有无的原则,必定是以众人的耳目所见所闻的实情以知有与无来作为标准的。 
人在学习上,如果不每天进步就会每天退步。