When public speaking， pause frequently. Pause before you say something in a new way， pause after you have said something you believe is important， and pause as a relief to let listeners absorb details.
我不敢说数学和疯狂之间有直接关系，但毫无疑问，伟大的数学家都具有狂热的特质。
It is justice, not charity, that is wanting in the world.