A bad attitude.

恶劣的态度

The greatest discovery you will ever make is that you can change your life by simply changing your attitude.

 

Optimism is the most essential human trait, becauseit allows you to evolve your ideas and improve every situati on you encounter.

 

So don't take things for granted. Be positive and realize how fortunate you are. Not every day will be perfect, but if you pay attention you'll realize that 99.9% of the time you're having either a good day or a great day.