那些说话算话的人有一点很天真：他们以为别人也和他们一样。
And that’s the thing about people who mean everything they say. They think everyone else does too.
诗歌是灵魂的语言，是难以言喻的声音。
逻辑是所有数学推理的基础。
Combinatorics is like the art of counting without actually counting.