《后汉书·列传·马援列传》
马援说 ：天下反反复复，窃取名字的人多如牛毛，今见陛下，宽宏大量，与高祖一样，就知道帝王自然有真的了。 
援曰： 天下反覆，盗名字者不可胜数。今见陛下，恢廓大度，同符高祖，乃知帝王自有真也。 
Ma Yuan said: The world is changing constantly. People who steal names are as many as the hair of an ox. Now that I have met your majesty, seeing that you are broad-minded and magnanimous, just like Emperor Gaozu, I know that the emperor must be the real one.