永远不要停止学习，因为世界永远不会停止变化。
Never stop learning, because the world never stops changing.
Democracy... while it lasts is more bloody than either aristocracy or monarchy. Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself. There is never a democracy that did not commit suicide.
The most dangerous thing is not the lies we tell others, but the lies we tell ourselves.
Nature does not make leaps.