逻辑学研究不仅仅是关于形式系统，更是关于推理本身的本质。

The past is hidden somewhere outside the realm, beyond the reach of intellect, in some material object (in the sensation which that material object will give us) which we do not suspect.

天地间万事万物的本质，惟有心静的人才能体味出来；天地间万事万物的规律，惟有心静的人才能彻底掌握。