"War is the continuation of politics." In this sense war is politics and war itself is a political action; since ancient times there has never been a… - Mao Zedong

今天，世界战争的危险和对中国的威胁主要来自美国的好战分子。他们侵占中国的台湾和台湾海峡，还想发动原子战争。我们有两条：第一，我们不要战争；第二，如果有人来侵略我们，我们就予以坚决回击。我们对共产党员和全国人民就是这样进行教育的。美国的原子讹诈，吓不倒中国人民。我国有六亿人口，有九百六十万平方公里的土地。美国那点原子弹，消灭不了中国人。即使美国的原子弹威力再大，投到中国来，把地球打穿了，把地球炸毁了，对于太阳系说来，还算是一件大事情，但对整个宇宙说来，也算不了什么。

There is an ancient Chinese fable called "The Foolish Old Man Who Removed the Mountains". It tells of an old man who lived in northern China long, long ago and was known as the Foolish Old Man of North Mountain. His house faced south and beyond his doorway stood the two great peaks, Taihang and Wangwu, obstructing the way. He called his sons, and hoe in hand they began to dig up these mountains with great determination. Another graybeard, known as the Wise Old Man, saw them and said derisively, "How silly of you to do this! It is quite impossible for you few to dig up those two huge mountains." The Foolish Old Man replied, "When I die, my sons will carry on; when they die, there will be my grandsons, and then their sons and grandsons, and so on to infinity. High as they are, the mountains cannot grow any higher and with every bit we dig, they will be that much lower. Why can't we clear them away?" Having refuted the Wise Old Man's wrong view, he went on digging every day, unshaken in his conviction. God was moved by this, and he sent down two angels, who carried the mountains away on their backs. Today, two big mountains lie like a dead weight on the Chinese people. One is imperialism, the other is feudalism. The Chinese Communist Party has long made up its mind to dig them up. We must persevere and work unceasingly, and we, too, will touch God's heart. Our God is none other than the masses of the Chinese people. If they stand up and dig together with us, why can't these two mountains be cleared away?

按照唯物辩证法的观点，自然界的变化，主要地是由于自然界内部矛盾的发展。社会的变化，主要地是由于社会内部矛盾的发展，即生产力和生产关系的矛盾，阶级之间的矛盾，新旧之间的矛盾，由于这些矛盾的发展，推动了社会的前进，推动了新旧社会的代谢。唯物辩证法是否排除外部的原因呢？并不排除。唯物辩证法认为外因是变化的条件，内因是变化的根据，外因通过内因而起作用。鸡蛋因得适当的温度而变化为鸡子，但温度不能使石头变为鸡子，因为二者的根据是不同的。各国人民之间的互相影响是时常存在的。在资本主义时代，特别是在帝国主义和无产阶级革命的时代，各国在政治上、经济上和文化上的互相影响和互相激动，是极其巨大的。十月社会主义革命不只是开创了俄国历史的新纪元，而且开创了世界历史的新纪元，影响到世界各国内部的变化，同样地而且还特别深刻地影响到中国内部的变化，但是这种变化是通过了各国内部和中国内部自己的规律性而起的。两军相争，一胜一败，所以胜败，皆决于内因。