对抗各种错误的最强大武器是理性。
The most formidable weapon against errors of every kind is reason.
定言命令只有一条，那就是：要只按照你同时能够愿意它成为一条普遍法则的那个准则去行动。
唯有通过形式，才能征服混沌。
只有向后看才能理解生活；但要生活好，则必须向前看。
"A dreamer is one who can only find his way by moonlight, and his punishment is that he sees the dawn before the rest of the world."
逻辑学研究不仅仅是关于形式系统，更是关于理性思维和话语的规范。