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" Metaphysics is a dark ocean without shores or lighthouse, strewn with many a philosophic wreck. "

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" By a lie, a man... annihilates his dignity as a man. "

" Religion is the recognition of all our duties as divine commands. "

" The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason. "

" A categorical imperative would be one which represented an action as objectively necessary in itself, without reference to any other purpose. "

" It is beyond a doubt that all our knowledge begins with experience. "

" All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason. "

" Experience without theory is blind, but theory without experience is mere intellectual play. "

" Science is organized knowledge. Wisdom is organized life. "

" Morality is not the doctrine of how we may make ourselves happy, but how we may make ourselves worthy of happiness. "

" All the interests of my reason, speculative as well as practical, combine in the three following questions: 1. What can I know? 2. What ought I to do? 3. What may I hope? "

" May you live your life as if the maxim of your actions were to become universal law. "

" Nothing is divine but what is agreeable to reason. "

" 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. "

" It is not necessary that whilst I live I live happily; but it is necessary that so long as I live I should live honourably. "

" Thoughts without content are empty, intuitions without concepts are blind. "

" In law a man is guilty when he violates the rights of others. In ethics he is guilty if he only thinks of doing so. "

" Out of timber so crooked as that from which man is made nothing entirely straight can be carved. "

" All thought must, directly or indirectly, by way of certain characters, relate ultimately to intuitions, and therefore, with us, to sensibility, because in no other way can an object be given to us. "

" Immaturity is the incapacity to use one's intelligence without the guidance of another. "

" Happiness is not an ideal of reason, but of imagination. "

" It is not God's will merely that we should be happy, but that we should make ourselves happy. "

" Even philosophers will praise war as ennobling mankind, forgetting the Greek who said: 'War is bad in that it begets more evil than it kills.' "

" So act that your principle of action might safely be made a law for the whole world. "

" To be is to do. "

" If man makes himself a worm he must not complain when he is trodden on. "

" From such crooked wood as that which man is made of, nothing straight can be fashioned. "

" But although all our knowledge begins with experience, it does not follow that it arises from experience. "

" Two things awe me most, the starry sky above me and the moral law within me. "

" 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. "

" What can I know? What ought I to do? What can I hope? "