The beauty of mathematics lies in its simplicity and universality.

Every improvement in the circumstances of the society tends either directly or indirectly to raise the real rent of land, to increase the real wealth of the landlord, his power of purchasing the labour, or the produce of the labour of other people.

消费者是国王。

Quality is not a destination, it is a journey.

永远不要停止学习，因为世界永远不会停止变化。