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The soul is characterized by these capacities; self-nutrition, sensation, thinking, and movement.
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For knowing is spoken of in three ways: it may be either universal knowledge or knowledge proper to the matter in hand or actualising such knowledge; consequently three kinds of error also are possible.
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In order to be effective you need not only virtue but also mental strength.
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Just as it sometimes happens that deformed offspring are produced by deformed parents, and sometimes not, so the offspring produced by a female are sometimes female, sometimes not, but male, because the female is as it were a deformed male.
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Error is multiform, whereas success is possible in one way only; so this is another reason why excess and deficiency are a mark of vice, and observance of the mean a mark of virtue: Goodness is simple, badness is manifold.
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Happiness, whether consisting in pleasure or virtue, or both, is more often found with those who are highly cultivated in their minds and in their character, and have only a moderate share of external goods, than among those who possess external goods to a useless extent but are deficient in higher qualities.
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It is impossible that each of the elements should be infinite. For that is body which has interval on all sides; and that is infinite which has extension without bound.
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Purpose is a desire for something in our own power, coupled with an investigation into its means.
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Friends enhance our ability to think and act.
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Doubt is the beginning of wisdom.
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It is no easy task to be good.
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The excellence of a thing is related to its proper function.
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The business of every art is to bring something into existence, and the practice of an art involves the study of how to bring into existence something which is capable of having such an existence and has its efficient cause in the maker and not in itself.
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When we deliberate it is about means and not ends.
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The society that loses its grip on the past is in danger, for it produces men who know nothing but the present, and who are not aware that life had been, and could be, different from what it is.
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Happiness does not lie in amusement; it would be strange if one were to take trouble and suffer hardship all one's life in order to amuse oneself.
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The one exclusive sign of thorough knowledge is the power of teaching.
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Temperance is a mean with regard to pleasures.
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Our actions determine our dispositions.
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We can do noble acts without ruling the earth and sea.
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All things are full of gods.
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Consider pleasures as they depart, not as they come.
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It is of itself that the divine thought thinks, and its thinking is a thinking on thinking.
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Some vices miss what is right because they are deficient, others because they are excessive, in feelings or in actions, while virtue finds and chooses the mean.