Must Quotes (page 132)
Experience is never at fault; it is only your judgment that is in error, in promising itself such results from experience as are not caused by our experiments. For having given a beginning, what follows from it must necessarily be a natural development of such a beginning, unless it has been subject to a contrary influence, while, if it is affected by any contrary influence, the result which ought to follow from the aforesaid beginning, will be found to partake of this contrary influence in...
Leonardo da Vinci
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In order to understand, observe, deduce, man must first be conscious of himself as alive. A living man knows himself not otherwise than as wanting, that is, he is conscious of his will. And his will, which constitutes the essence of his life, man is conscious of and cannot be conscious of otherwise than as free.
Leo Tolstoy