Goethe famously said:

1. If you want to criticize the surrounding scenery, you must climb the roof first.

2. People who have not eaten bread with tears are people who don't know the taste of life.

3. It is not enough to have knowledge, but also to use it; It is not enough to have a wish, but also to act.

4. What can't be done today will not be done tomorrow. You can't waste a day. You must make up your mind to grasp the possible things and hold them tightly. If you are determined, you won't let them escape, and you must carry them out.

5. Misunderstanding and slackness in the world may be worse than treachery and malice.