The human being cannot live in a condition of emptiness for very long: if he is not growing toward something, he does not merely stagnate; the pent-up potentialities turn into morbidity and despair, and eventually into destructive activities.

For every dollar you spend purchasing something substantial， expect to pay a dollar in repairs， maintenance， or disposal by the end of its life.

如果你有梦想的话，就要去捍卫它。那些一事无成的人想告诉你你也成不了大器。如果你有理想的话，就要去努力实现。就这样。

可持续性不仅是责任，也是创新的机会。

The mind is a biological instrument for managing life's challenges.