Derek Parfit > Quotes

“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.”
― Derek Parfit, Reasons and Persons

“What now matters most is how we respond to various risks to the survival of humanity. We are creating some of these risks, and discovering how we could respond to these and other risks. If we reduce these risks, and humanity survives the next few centuries, our descendants or successors could end these risks by spreading through this galaxy.

Life can be wonderful as well as terrible, and we shall increasingly have the power to make life good. Since human history may be only just beginning, we can expect that future humans, or supra-humans, may achieve some great goods that we cannot now even imagine. In Nietzsche’s words, there has never been such a new dawn and clear horizon, and such an open sea.

If we are the only rational beings in the Universe, as some recent evidence suggests, it matters even more whether we shall have descendants or successors during the billions of years in which that would be possible. Some of our successors might live lives and create worlds that, though failing to justify past suffering, would give us all, including some of those who have suffered, reasons to be glad that the Universe exists.”
― Derek Parfit, On What Matters: Volume 3

“We ought not to do to our future selves what it would be wrong to do to other people.”
― Derek Parfit, Reasons and Persons

“What am I more than elaborate sentience?”
― Derek Parfit, On What Matters

“What now matters most is that we avoid ending human history. If there are no rational beings elsewhere, it may depend on us and our successors whether it will all be worth it, because the existence of the Universe will have been on the whole good.”
― Derek Parfit, On What Matters, Vol. 2

“I believe that most of us have false beliefs about our own nature, and our identity over time, and that, when we see the truth, we ought to change some of our beliefs about what we have reason to do.”
― Derek Parfit, Reasons and Persons

“Criticizing himself again, Sidgwick writes: I am not an original man: and I think less of my own thoughts every day.”
― Derek Parfit, On What Matters

“Until this century, most of mankind lived in small communities. What each did could affect only a few others. But conditions have now changed. Each of us can now, in countless ways, affect countless other people. We can have real though small effects on thousands or millions of people. When these effects are widely dispersed, they may be either trivial, or imperceptible. It now makes a great difference whether we continue to believe that we cannot have greatly harmed or benefited others unless there are people with obvious grounds for resentment or gratitude.”
― Derek Parfit, Reasons and Persons

“Philosophers should not only interpret our beliefs; when they are false, they should change them.”
― Derek Parfit, Reasons and Persons

“When I believed that my existence was such 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. Other people are closer. I am less concerned about the rest of my own life, and more concerned about the lives of others.”
― Derek Parfit, Reasons and Persons

“Disbelief in God, openly admitted by a majority, is a recent event, not yet completed. Because this event is so recent, Non-Religious Ethics is at a very early stage. We cannot yet predict whether, as in Mathematics, we will all reach agreement. Since we cannot know how Ethics will develop, it is not irrational to have high hopes.”
― Derek Parfit, Reasons and Persons

“If there were no such normative truths, nothing would matter, and we would have no reasons to try to decide how to live. Such decisions would be arbitrary. We would not be the animals that can understand and respond to reasons. In a world without reasons, we would act only on our instincts and desires, living as other animals live. The Universe would not contain rational beings.”
― Derek Parfit, On What Matters, Vol. 2

“This part of Kant's view is, I believe, a profound truth. We can be morally responsible in several other ways, or senses, but no one could ever be responsible, I believe, in any way that could make them deserve to suffer. Nor, I believe, does anyone deserve to be less happy.”
― Derek Parfit

“«No fui yo quien hizo esto, sino un yo anterior»,”
― Derek Parfit, Razones y personas

“For any possible population of at least ten billion people, all with a very high quality of life, there must be some much larger imaginable population whose existence, if other things are equal, would be better even though its members have lives that are barely worth living.”
― Derek Parfit, Reasons and Persons