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61 " The greatest minds are capable of the greatest vices as well as of the greatest virtues. "
― René Descartes
62 " Dubito, ergo cogito, ergo sum.(English: "I doubt, therefore I think, therefore I am") "
63 " In order to seek truth, it is necessary once in the course of our life to doubt, as far as possible, of all things. "
64 " In order to improve the mind, we ought less to learn than to contemplate. "
65 " For I found myself embarrassed with so many doubts and errors that it seemed to me that the effort to instruct myself had no effect other than the increasing discovery of my own ignorance "
66 " He who hid well, lived well. "
67 " Each problem that I solved became a rule which served afterwards to solve other problems "
68 " At last I will devote myself sincerely and without reservation to the general demolition of my opinions. "
― René Descartes , Discourse on Method
69 " Dubium sapientiae initium. (Doubt is the origin of wisdom.) "
― René Descartes , Meditations on First Philosophy
70 " Le cœur a ses raisons que la raison ne connaît point. "
71 " ...it is a mark of prudence never to place our complete trust in those who have deceived us even once. "
72 " Because reason...is the only thing that makes us men, and distinguishes us from the beasts, I would prefer to believe that it exists, in its entirety, in each of us... "
73 " The reading of all good books is indeed like a conversation with the noblest men of past centuries who were the authors of them, nay a carefully studied conversation, in which they reveal to us none but the best of their thoughts. "
74 " Good sense is the most equitably distributed of all things because no matter how much or little a person has, everyone feels so abundantly provided with good sense that he feels no desire for more than he already possesses. "
75 " But I cannot forget that, at other times I have been deceived in sleep by similar illusions; and, attentively considering those cases, I perceive so clearly that there exist no certain marks by which the state of waking can ever be distinguished from sleep, that I feel greatly astonished; and in amazement I almost persuade myself that I am now dreaming. "
76 " I doubt, therefore I think, therefore I am. "
77 " Bad books engender bad habits, but bad habits engender good books. "
78 " It is best not to go on for great quest for truth , it will only make you miserable "
79 " But what then am I? A thing that thinks. What is that? A thing that doubts, understand, affirms, denies, wills, refuses, and that also imagines and senses. "
80 " Whatever I have up till now accepted as most true and assured I have gotten either from the senses or through the senses. But from time to time I have found that the senses deceive, and it is prudent never to trust completely those who have deceived us even once. "