主从内而外工作，世界从外而内工作。
In business, if you're not failing occasionally, you're not trying hard enough.
Teaching is not about imparting everything, but about guiding at the right moment.
The fundamental impulse that sets and keeps the capitalist engine in motion comes from the new consumers' goods, the new methods of production or transportation, the new markets, the new forms of industrial organization that capitalist enterprise creates.