"The only limit to our realization of tomorrow is our doubts of today."

"The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next."

关键是设定现实的客户期望，然后不仅要满足它们，还要超越它们——最好是以意想不到和有益的方式。

在数学中，提出问题的艺术必须比解决问题更有价值。