Your most unhappy customers are your greatest source of learning.

True progress in farming comes from observing and learning from nature.

我生来就是为了赢，但为了赢我必须愿意输。

Libraries were full of ideas—perhaps the most dangerous and powerful of all weapons.

The journey of a thousand miles begins with one step.

解析：事和道是一体的。

所有商品的交换价值随着生产难度的增加而上升。