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"Virtue can be taught" -
He believes “the unexamined life is not worth living.” One must seek knowledge and wisdom before private interests. In this manner, knowledge is sought as a means to ethical action.
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"It is only by being virtuous that we can hope to be happy." -
Happiness or well-being (eudaimonia) is the highest aim of moral thought and conduct, and the virtues (aretê: 'excellence') are the requisite skills and dispositions needed to attain it.
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"To be happy you need to live a life of moderation" -
Aristotle's ethics, or study of character, is built around the premise that people should achieve an excellent character (a virtuous character, "ethikē aretē" in Greek) as a pre-condition for attaining happiness or well-being (eudaimonia).
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"The use of good Reason to inform Good Will helps highlight your duty in any situation" -
Kant's ethics are organized around the notion of a “categorical imperative,” which is a universal ethical principle stating that one should always respect the humanity in others, and that one should only act in accordance with rules that could hold for everyone.
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"The said truth is that is is the Greatest happiness of the greatest number that is the measure of right and wrong" -
Influenced by many enlightenment thinkers, especially empiricists such as John Locke and David Hume, Bentham developed an ethical theory grounded in a largely empiricist account of human nature. ... Happiness, according to Bentham, is thus a matter of experiencing pleasure and lack of pain.