And, just as in
pulling down an old house, we usually reserve the ruins to contribute
towards the erection, so, in destroying such of my opinions as I judged to
be Ill-founded, I made a variety of observations and acquired an amount of
experience of which I availed myself in the establishment of more certain.
And further, I continued to exercise myself in the method I had
prescribed; for, besides taking care in general to conduct all my thoughts
according to its rules, I reserved some hours from time to time which I
expressly devoted to the employment of the method in the solution of
mathematical difficulties, or even in the solution likewise of some
questions belonging to other sciences, but which, by my having detached
them from such principles of these sciences as were of inadequate
certainty, were rendered almost mathematical: the truth of this will be
manifest from the numerous examples contained in this volume. And thus,
without in appearance living otherwise than those who, with no other
occupation than that of spending their lives agreeably and innocently,
study to sever pleasure from vice, and who, that they may enjoy their
leisure without ennui, have recourse to such pursuits as are honorable, I
was nevertheless prosecuting my design, and making greater progress in the
knowledge of truth, than I might, perhaps, have made had I been engaged in
the perusal of books merely, or in holding converse with men of letters.
These nine years passed away, however, before I had come to any
determinate judgment respecting the difficulties which form matter of
dispute among the learned, or had commenced to seek the principles of any
philosophy more certain than the vulgar.
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