Money is only a tool. It will take you wherever you wish, but it will not replace you as the driver.

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.

奈奎斯特准则提供了一种图形方法来确定闭环系统的稳定性。