"The essence of mathematics is not to make simple things complicated, but to make complicated things simple."

If you want to fly, you have to give up the things that weigh you down.

译文：性只有一个：从它的形体方面来说叫做天，从它的主宰方面来说叫做帝，从它的流行方面来说叫做命，赋予人叫做性，在人身上起主导作用叫做心。

Coal will remain part of the energy mix, but it must be cleaner and more responsible.