People believe in God because the world is very complicated and they think it is very unlikely that anything as complicated as a flying squirrel or the human eye or a brain could happen by chance.
The value of a mental process lies in its utility for the organism's adjustment to life.
There is no escape from the labyrinth of existence.
Most of what makes a book 'good' is that we are reading it at the right moment for us.
对年轻人的适当教育不在于将大量从不同作者那里拖来的词语、句子和想法塞进他们的头脑，而在于打开他们对外部世界的理解。
世界是一本书，不旅行的人只读了一页。