Sou uma máquina, a quem a imitação da vida foi dada apenas por conta da interação positrônica no meu cérebro... que é um dispositivo criado pelo home… - Isaac Asimov

Baley said thoughtfully, "All men are 'endowed by their Creator with certain unalienable rights … among these are life, liberty, and the pursuit of happiness.' " "You've hit it. Where's that from?" "Some old document," said Baley.

It merely required the use of that much-neglected commodity — common sense. You see, there is a branch of human knowledge known as symbolic logic, which can be used to prune away all sorts of clogging deadwood that clutters up human language.

Old men tend to forget what thought was like in their youth; they forget the quickness of the mental jump, the daring of the youthful intuition, the agility of the fresh insight. They become accustomed to the more plodding varieties of reason, and because this is more than made up by the accumulation of experience, old men think themselves wiser than the young.