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" Ingratitude is the essence of vileness. "

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

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

" 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. "

" 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.' "

" 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. "

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

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

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

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

" 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. "

" 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. "

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

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

" 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. "

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

" I had therefore to remove knowledge, in order to make room for belief. "

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

" 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. "

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

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

" Live your life as though your every act were to become a universal law. "

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

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

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

" 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? "

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

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

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

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

" Always recognize that human individuals are ends, and do not use them as means to your end. "