We must learn from nature how to use resources efficiently.
You can tell more about a person by what he says about others than you can by what others say about him.  
我是自由的,无论周围有什么规则。如果我觉得它们可以忍受,我就忍受它们;如果我觉得它们太讨厌,我就打破它们。我是自由的,因为我知道只有我自己在道德上对我所做的一切负责。
The reward of seeing the joy on the faces of the parents is immense.