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Education begins at the level of the learner.
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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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Purpose is a desire for something in our own power, coupled with an investigation into its means.
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For that which has become habitual, becomes as it were natural.
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In order to be effective you need not only virtue but also mental strength.
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The soul is characterized by these capacities; self-nutrition, sensation, thinking, and movement.
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Thou wilt find rest from vain fancies if thou doest every act in life as though it were thy last.
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The excellence of a thing is related to its proper function.
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The high-minded man does not bear grudges, for it is not the mark of a great soul to remember injuries, but to forget them.
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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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We work to earn our leisure.
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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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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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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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How many a dispute could have been deflated into a single paragraph if the disputants had dared to define their terms.
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He who is to be a good ruler must have first been ruled.
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There is a foolish corner in the brain of the wisest man.
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Our actions determine our dispositions.
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The one exclusive sign of thorough knowledge is the power of teaching.
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Friends enhance our ability to think and act.
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When we deliberate it is about means and not ends.
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Perhaps here we have a clue to the reason why royal rule used to exist formerly, namely the difficulty of finding enough men of outstanding virtue.
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The ideal man takes joy in doing favors for others.
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Authority is no source for Truth.