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Freedom is the alone unoriginated birthright of man, and belongs to him by force of his humanity; and is independence on the will and co-action of every other in so far as this consists with every other person’s freedom.
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Two things fill the mind with ever-increasing wonder and awe, the more often and the more intensely the mind of thought is drawn to them: the starry heavens above me and the moral law within me.
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The light dove, cleaving the air in her free flight, and feeling its resistance, might imagine that its flight would be still easier in empty space.
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He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.
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Experience without theory is blind, but theory without experience is mere intellectual play.
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Two things awe me most, the starry sky above me and the moral law within me.
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Seek not the favor of the multitude; it is seldom got by honest and lawful means. But seek the testimony of few; and number not voices, but weigh them.
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Live your life as though your every act were to become a universal law.
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It is beyond a doubt that all our knowledge begins with experience.
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This problem is the most difficult and the last to be solved by mankind.
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The yellow Indians do have a meagre talent. The Negroes are far below them, and at the lowest point are a part of the American people.
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The hand is the visible part of the brain.
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It is not God's will merely that we should be happy, but that we should make ourselves happy.
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Nothing is divine but what is agreeable to reason.
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If man makes himself a worm he must not complain when he is trodden on.
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Intuition and concepts constitute... the elements of all our knowledge, so that neither concepts without an intuition in some way corresponding to them, nor intuition without concepts, can yield knowledge.
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Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck.
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Immaturity is the incapacity to use one's intelligence without the guidance of another.
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Have patience awhile; slanders are not long-lived. Truth is the child of time; erelong she shall appear to vindicate thee.
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Perpetual Peace is only found in the graveyard.
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Rules for Happiness: something to do, someone to love, something to hope for.
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Always recognize that human individuals are ends, and do not use them as means to your end.
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All natural capacities of a creature are destined to evolve completely to their natural end.
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If an offender has committed murder, he must die. In this case, no possible substitute can satisfy justice. For there is no parallel between death and even the most miserable life, so that there is no equality of crime and retribution unless the perpetrator is judicially put to death.