看书求理,须令自家胸中点头;与人谈理,须令人家胸中点头。
读书求明理,须让自己满意;与别人谈道理,须令别人佩服。
A man who does not keep his word is no man at all.
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."