最重要的实验是那些挑战我们自以为知道的事情。

The artist must be a shadow of the eternal.

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.

Force and fraud are in war the two cardinal virtues.

拓扑学是对图形在任何变形下保持不变的性质的研究。