Psychology must be based on direct experience and introspection.
心理学必须建立在直接经验和内省的基础上。
单子是不可分割的实体,是构成世界的基本元素。
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.