The hardest part of designing a system is deciding what to build.

It takes a strong man to save himself, and a great man to save another.

The history of philosophy is not, like the history of the sciences, to be considered as a mere chronological record of discoveries and errors. It is the history of the human spirit in its endeavor to understand itself and its relation to the universe.

持续改进不仅仅是一个流程，而是一种应该深入每个员工内心的思维方式。