The theory of economic development is the study of how the economic system generates the forces which incessantly transform it.

没有所谓的应用科学，只有科学的应用。

人们要求言论自由作为他们很少使用的思想自由的补偿。

"I am not young enough to know everything."

Be still. Apart from this the mind has no task to do or thought to think.

"When we love, we always strive to become better than we are. When we strive to become better than we are, everything around us becomes better too."

多样性不仅仅是要达成的指标，更是可以发挥的优势。