I don't write songs, I write soundtracks.
我不写歌曲,我写的是原声带。
I think I'm afraid to be happy...because whenever I get too happy, something bad always happens.
——1963年6月25日在西德市政厅柏林墙前的演说
数学中最美丽的东西是复杂背后的简单思想。
Never stop learning; the world is always changing.