Psychological theories must pass the test of practical experience.

人生的意义在于追求真理和美德。

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.

生活中最大的荣耀不在于从不跌倒，而在于每次跌倒后都能站起来。

在农业中，耐心不仅是一种美德；更是质量的必要条件。