"In observational studies, we often have to rely on assumptions that are not directly testable."

The most important thing in investing is to have a plan and stick to it.

Our heroes are human heroes. That's a very new situation. Most other societies have had, right at their center, the worship of something transcendent: a god, a spirit, a natural force, the universe, whatever it is -- something else that is being worshiped. We've slightly lost the habit of doing that, which is, I think, why we're particularly drawn to nature.

任何公司最有价值的资产都是它的员工。