The invention of the cotton gin was the result of necessity and observation.
"We all live with the objective of being happy; our lives are all different and yet the same."
只要心意不放纵，就不会出现差错；只要用心不怠惰疏忽，就没有不能坚守的、随意放纵的志向。
The behavior of the whole cannot be predicted from the behavior of its parts taken separately.
It's not the customer's job to know what they want.
没有人会发动战争——或者说，理智的人不应该这样做——除非他首先清楚自己希望通过战争实现什么目标以及如何指挥战争。