意志不坚强的人,智慧也不会高到哪里去;说话不算数的人,做事也不会果敢痛快。
——〈在广州农民运动讲习所第一届毕业礼演说〉,对讲习所学员发出警告,无法在中国发动阶级斗争,反之应该要用平和方法,以合作为诉求,1924年8月21日
Mathematics is not a deductive science—that's a cliché. When you try to prove a theorem, you don't just list the hypotheses and then start to reason. What you do is trial and error, experimentation, guesswork.
Polka dots can't stay alone, like human existence.