Rule of 7 in research. You can find out anything if you are willing to go seven levels. If the first source you ask doesn’t know， ask them who you should ask next， and so on down the line. If you are willing to go to the 7th source， you’ll almost always get your answer.

人生是由小小的幸福积累而成的。

"The only way to have a friend is to be one."

生活是条沉船，但我们不要忘了在救生艇上高歌。

《三民主义·民权主义·第二讲》（1924年3月16日）

革命并不容易，但它是可能的。