To define is to limit.

History teaches us that in 100 years from now some of the assumptions you believed will turn out to be wrong. A good question to ask yourself today is “What might I be wrong about？”

译文：古代的士、农、工、商四种职业不同但遵循的道是相同的，他们尽自己的心力，在这一点上是一样的。