The political liberty of the subject is a tranquility of mind arising from the opinion each person has of his safety.

The science shows that our minds lie to us about what will make us happy.

与他人说话时，要留有余地，别把心里想说的全部讲出来；画虎的形态很简单，但画出骨骼却很难；熟悉人的面貌很容易，但真正了解一个人的内心却很难。