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By a lie a man throws away and, as it were, annihilates his dignity as a man. A man who himself does not believe what he tells another ... has even less worth than if he were a mere thing. ... makes himself a mere deceptive appearance of man, not man himself.
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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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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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We can never, even by the strictest examination, get completely behind the secret springs of action.
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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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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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So act that anything you do may become universal law.
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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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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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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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In all judgements by which we describe anything as beautiful, we allow no one to be of another opinion.
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In the mere concept of one thing it cannot be found any character of its existence.
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The two great dividers are religion and LANGUAGE.
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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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Human beings are never to be treated as a means but always as ends.
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Suicide is not abominable because God prohibits it; God prohibits it because it is abominable.
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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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An organized product of nature is that in which all the parts are mutually ends and means.
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We can judge the heart of a man by his treatment of animals.
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Prudence reproaches; conscience accuses.
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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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The only thing permanent is change.
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It is through good education that all the good in the world arises.
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...as soon as we examine suicide from the standpoint of religion we immediately see it in its true light. We have been placed in this world under certain conditions and for specific purposes. But a suicide opposes the purpose of his creator; he arrives in the other world as one who has deserted his post; he must be looked upon as a rebel against God. God is our owner; we are his property; his providence works for our good.