Derek Parfit - Reasons and Persons (1984)

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To be a person, a being must be self-conscious, aware of its identity and its continued existence over time.

Derek Parfit

We are paternalists when we make someone act in his own interests.

Derek Parfit

Is the truth depressing? Some may find it so. But I find it liberating, and consoling. When I believed that my existence was a further fact, I seemed imprisoned in myself. My life seemed like a glass tunnel, through which I was moving faster every year, and at the end of which there was darkness. When I changed my view, the walls of my glass tunnel disappeared. I now live in the open air. There is still a difference between my life and the lives of other people. But the difference is less. I am less concerned about the rest of my own life, and more concerned about the lives of others.

Derek Parfit

It is not enough to ask, 'Will my act harm other people?' Even if the answer is No, my act may still be wrong, because of its effects on other people. I should ask, 'Will my act be one of a set of acts that will together harm other people?' The answer may be Yes. And the harm to others may be great. If this is so, I may be acting very wrongly, like the Harmless Torturers.

Derek Parfit