Freedom does not consist in any dreamt-of independence from natural laws, but in the knowledge of these laws, and in the possibility this gives of systematically making them work towards definite ends.

世界称之为不道德的书籍，是那些展示了世界自身羞耻的书籍。

创造力不是奢侈品；它是过上有意义生活的必需品。