我不是因为快乐而歌唱，而是因为歌唱而快乐。
I don't sing because I'm happy; I'm happy because I sing.
"The truth is rarely pure and never simple."
The truth is a beautiful and terrible thing, and should therefore be treated with great caution.
The key to success is persistence and continuous improvement.
我对金钱或名誉不感兴趣；我不想像动物园里的动物一样被展示。