“Nothing is more incontestable than the existence of our sensations; …”
in the Discours préliminaire de l’Encyclopédie http://fr.wikisource.org/wiki/Discours_pr%C3%A9liminaire_de_l%E2%80%99Encyclop%C3%A9die.
Kontext: Nothing is more incontestable than the existence of our sensations;...