In science, as in life, the important things are rarely simple or obvious.

Speech is a kind of action， and our words are the tools we use to perform it.

释义：他或许认为，物质的产生和消亡都源于气的聚散，气是物质生死循环的驱动力。

"Purpose gives meaning to mental activity."

The human race has one really effective weapon, and that is laughter.

理解变化的唯一方法就是投入其中，随之而动，加入舞蹈。