Take note if you find yourself wondering “Where is my good knife？ Or， where is my good pen？” That means you have bad ones. Get rid of those.

A mathematician is a device for turning coffee into theorems.

【译文】君子成全别人的好事，不帮助别人做成坏事。小人与此相反。

房子是一座小城市，城市是一所大房子。