The first precept was never to accept a thing as true until I knew it as such without a single doubt.

Although my knowledge grows more and more, nevertheless I do not for that reason believe that it can ever be actually infinite, since it can never reach a point so high that it will be unable to attain any greater increase.

At last I will devote myself sincerely and without reservation to the general demolition of my opinions.

Divide each difficulty at hand into as many pieces as possible and as could be required to better solve them.

Instead I ought to be grateful to Him who never owed me anything for having been so generous to me, rather than think that He deprived me of those things or has taken away from me whatever He did not give me.

In the matter of a difficult question it is more likely that the truth should have been discovered by the few than by the many.

So blind is the curiosity by which mortals are possessed, that they often conduct their minds along unexplored routes, having no reason to hope for success, but merely being willing to risk the experiment of finding whether the truth they seek lies there.