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Beginning to reason is like stepping onto an escalator that leads upward and out of sight. Once we take the first step, the distance to be traveled is independent of our will and we cannot know in advance where we shall end.
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Speciesism-the word is not an attractive one, but I can think of no better term-is a prejudice or attitude of bias in favor of the interests of members of one's own species and against those of members of other species.
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Philosophy is not politics, and we do our best, within our all-too-human limitations, to seek the truth, not to score points against opponents. There is little satisfaction in gaining an easy triumph over a weak opponent while ignoring better arguments against your views.
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The goal of maximizing the welfare of all may be better achieved by an ethic that accepts our inclinations and harnesses them so that, taken as a whole, the system works to everyone's advantage.
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Ethics seems a morass which we have to cross, but get hopelessly bogged in when we make the attempt.
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There can be no brotherhood when some nations indulge in previously unheard of luxuries, while others struggle to stave off famine.
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We are responsible not only for what we do but also for what we could have prevented.
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Since ancient times, philosophers have maintained that to strive too hard for one's own happiness is self-defeating.
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Everyday we act in ways that reflect our ethical judgements.
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There may have been times when I wondered if there might be a God, but it always seemed to me wildly implausible that a God worth worshipping could allow the Holocaust to occur.
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The principles of ethics come from our own nature as social, reasoning beings.
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It is easy for us to criticize the prejudices of our grandfathers, from which our fathers freed themselves. It is more difficult to search for prejudices among the beliefs and values that we hold.
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Animal Liberation is Human Liberation too.
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The capacity to reason is a special sort of capacity because it can lead us to places that we did not expect to go.
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Human social institutions can effect the course of human evolution. Just as climate, food supply, predators, and other natural forces of selection have molded our nature, so too can our culture.
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Science does not stand still, and neither does philosophy, although the latter has a tendency to walk in circles.
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Ethics is inescapable.
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Human beings are social animals. We were social before we were human.
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The core of ethics runs deep in our species and is common to human beings everywhere. It survives the most appalling hardships and the most ruthless attempts to deprive human beings of their humanity. Nevertheless, some people resist the idea that his core has a biological basis which we have inherited from our pre-human ancestors.
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If evolution is a struggle for survival, why hasn't it ruthlessly eliminated altruists, who seem to increase another's prospects of survival at the cost of their own?