7 ;;Quote: better to use common sense and simple reasoning than book learning, philosophy, majority opinion, logic, geometrical analysis, or algebra

10 ;;Quote: Descartes' method: accept only clearly evident truths, divide difficulties into parts, build up knowledge by degrees, and review everything

10 ;;Quote: careful deduction as in geometric proofs can reveal all human knowledge

11 ;;Quote: combine geometrical analysis with algebra by reducing proportions to simple symbols and relations

30 ;;Quote: the body of an animal is like a machine made by God. It is incomparably better ordered, with many more parts, and far more admirable movements

30 ;;Quote: a machine made in the likeness of a nonrational animal would be indistinguishable from the animal; not true for a human

30+;;Quote: a machine can not mimic a human's ability with language and knowledge. It could not answer to the sense of all that was said, nor could it act through knowledge

31 ;;Quote: it is not true that animals speak; otherwise they could make themselves understood by us

33 ;;Quote: we know little; with greater knowledge we might rid ourselves of an infinity of maladies, perhaps even the enfeeblement of old age

33 ;;Quote: Descartes found a road to truth and asked others to join so that we might together advance further than a single individual could alone

34 ;;Quote: experiments are needed to determine the correct hypothesis; nature is so vast and the principles so simple that many hypotheses are reasonable