【释义】不做那些自己不该做的事，不要贪图那些不属于自己的东西。

世界是一本书，不旅行的人只读了一页。

However difficult life may seem, there is always something you can do, and succeed at. It matter that you don’t just give up.

As in geometry the most natural way of beginning is from a mathematical point, so is the same method in observations and natural history the most genuine, simple, and instructive.

一个人若不能治理自己，便不能治理家庭；若不能治理家庭，便不能治理城市；若不能治理城市，便不能治理国家。