我们必须保持警惕，坚决与一切内外敌人作斗争。
We must be vigilant and resolutely fight against all enemies, both internal and external.
别让别人的意见淹没了你内心的声音。
There is nothing more deceptive than an obvious fact.
预言是人类唯一一项无法由重复练习而进步的技术。