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All persons ought to endeavor to follow what is right, and not what is established.
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Therefore, the good of man must be the end of the science of politics.
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We assume therefore that moral virtue is the quality of acting in the best way in relation to pleasures and pains, and that vice is the opposite.
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It is through wonder that men now begin and originally began to philosophize; wondering in the first place at obvious perplexities, and then by gradual progression raising questions about the greater matters too.
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Friends are an aid to the young, to guard them from error; to the elderly, to attend to their wants and to supplement their failing power of action; to those in the prime of life, to assist them to noble deeds.
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For though we love both the truth and our friends, piety requires us to honor the truth first.
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To be ignorant of motion is to be ignorant of nature.
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Men pay most attention to what is their own: they care less for what is common; or, at any rate, they care for it only to the extent to which each is individually concerned.
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All friendly feelings toward others come from the friendly feelings a person has for himself.
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The habits we form from childhood make no small difference, but rather they make all the difference.
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The difference between a learned man and an ignorant one is the same as that between a living man and a corpse.
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Even when laws have been written down, they ought not always to remain unaltered.
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In the works of Nature, purpose, not accident, is the main thing.
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He who is unable to live in society, or who has no need because he is sufficient for himself, must be either a beast or a god.
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A friend is a second self, so that our consciousness of a friend's existence...makes us more fully conscious of our own existence.
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The intention makes the crime.
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The basis of a democratic state is liberty.
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So it is naturally with the male and the female; the one is superior, the other inferior; the one governs, the other is governed; and the same rule must necessarily hold good with respect to all mankind.
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Before you heal the body you must first heal the mind.
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To enjoy the things we ought and to hate the things we ought has the greatest bearing on excellence of character.
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Justice is that virtue of the soul which is distributive according to desert.
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Fear is pain arising from the anticipation of evil.
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Being a father is the most rewarding thing a man whose career has plateaued can do.
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When there is no middle class, and the poor greatly exceed in number, troubles arise, and the state soon comes to an end.