知足常乐,终身不辱。
贪心不足蛇吞象,知足才能心安。  
Investing in cleaner coal technologies is investing in our planet's future.
在解释行为时,意志的概念是不必要的。
推动的关键是使期望的行为更加突出、更容易和更有吸引力。
The more you are in a state of gratitude, the more you will attract things to be grateful for.