The artist must be in his work as God is in creation, invisible and all-powerful; one must sense him everywhere but never see him.
Curiosity is the driving force of science.
以这样奢侈的国君,去统治那些爱好奢侈的臣民,想要国家不动乱,是不可能的。
机械和节省劳力的装置只有在降低制造成本时才具有价值。