人类的进步和胜利全靠发自内在的力量。
There is no man, however wise, who has not at some period of his youth said things, or lived in a way the consciousness of which is so unpleasant to him in later life that he would gladly, if he could, expunge it from his memory.
最好的科幻小说不是关于未来；它是关于现在。
A great truth is a truth whose opposite is also a great truth.