Quiconque possédait certaines habitudes d’observation et d’analyse ne pouvait s’y tromper et devait aboutir ainsi a des conclusions aussi mathématiques que celles d’Euclide dans ses célebres théoremes.
Deceit, according to him, was an impossibility in the case of one trained to observation and analysis. His conclusions were as infallible as so many propositions of Euclid.