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Without man and his potential for moral progress, the whole of reality would be a mere wilderness, a thing in vain, and have no final purpose.
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Have the courage to use your own reason- That is the motto of enlightenment. "Foundations of the Metaphysics of Morals" (1785)
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Arrogance is, as it were, a solicitation on the part of one seeking honor for followers, whom he thinks he is entitled to treat with contempt.
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We can never, even by the strictest examination, get completely behind the secret springs of action.
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Manners or etiquette ('accessibility, affability, politeness, refinement, propriety, courtesy, and ingratiating and captivating behavior') call for no large measure of moral determination and cannot, therefore, be reckoned as virtues. Even though manners are no virtues, they are a means of developing virtue.... The more we refine the crude elements in our nature, the more we improve our humanity and the more capable it grows of feeling the driving force of virtuous principles.
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Of all the arts poetry (which owes its origin almost entirely to genius and will least be guided by precept or example) maintains the first rank.
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In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.
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So act that anything you do may become universal law.
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The two great dividers are religion and LANGUAGE.
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Thrift is care and scruple in the spending of one's means. It is not a virtue and it requires neither skill nor talent.
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Freedom is independence of the compulsory will of another, and in so far as it tends to exist with the freedom of all according to a universal law, it is the one sole original inborn right belonging to every man in virtue of his humanity.
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Reason must approach nature in order to be taught by it. It must not, however, do so in the character of a pupil who listens to everything that the teacher chooses to say, but of an appointed judge who compels the witness to answer questions which he has himself formulated.
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The sum total of all possible knowledge of God is not possible for a human being, not even through a true revelation. But it is one of the worthiest inquiries to see how far our reason can go in the knowledge of God.
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In the mere concept of one thing it cannot be found any character of its existence.
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I learned to honor human beings, and I would find myself far more useless than the common laborer if I did not believe that this consideration could impart to all others a value establishing the rights of humanity.
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We can judge the heart of a man by his treatment of animals.
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An organized product of nature is that in which all the parts are mutually ends and means.
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Suicide is not abominable because God prohibits it; God prohibits it because it is abominable.
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Prudence reproaches; conscience accuses.
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The only thing permanent is change.
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God put a secret art into the forces of Nature so as to enable it to fashion itself out of chaos into a perfect world system.
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It is through good education that all the good in the world arises.
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Human beings are never to be treated as a means but always as ends.
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To a high degree we are, through art and science, cultured. We are civilized - perhaps too much for our own good - in all sorts of social grace and decorum. But to consider ourselves as having reached morality - for that, much is lacking.