Rene Descartes Quotes About Certainty

Quotes about: Certainty

• ... moral certainty is certainty which is sufficient to regulate our behaviour, or which measures up to the certainty we have on matters relating to the conduct of life which we never normally doubt, though we know that it is possible, absolutely speaking, that they may be false.

  Rene Descartes

  Doubt, Behaviour, May

• I did not imitate the skeptics who doubt only for doubting's sake, and pretend to be always undecided; on the contrary, my whole intention was to arrive at a certainty, and to dig away the drift and the sand until I reached the rock or the clay beneath.

  Rene Descartes

  Rocks, Doubt, Clay

• When I consider this carefully, I find not a single property which with certainty separates the waking state from the dream. How can you be certain that your whole life is not a dream?

  Rene Descartes

  Love, Dream, Ontology

• 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.

  Rene Descartes

  Believe, Ontology, Logic

  Rene Descartes, Elizabeth Sanderson Haldane, G. R. T. Ross (2003). “Discourse on Method and Meditations”, p.89, Courier Corporation

• Neither the true nor the false roots are always real; sometimes they are imaginary; that is, while we can always imagine as many roots for each equation as I have assigned, yet there is not always a definite quantity corresponding to each root we have imagined.

  Rene Descartes

  Real, Roots, Ontology

• We call infinite that thing whose limits we have not perceived, and so by that word we do not signify what we understand about a thing, but rather what we do not understand.

  Rene Descartes

  Ontology, Limits, Logic

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