And therefore in geometry (which is the only science that it hath pleased God hitherto to bestow on mankind), men begin at settling the significations of their words; which settling of significations, they call definitions, and place them in the beginning of their reckoning.
Thomas HobbesThe errors of definitions multiply themselves according as the reckoning proceeds; and lead men into absurdities, which at last they see but cannot avoid, without reckoning anew from the beginning.
Thomas HobbesOpinion of ghosts, ignorance of second causes, devotion to what men fear, and talking of things casual for prognostics, consisteth the natural seeds of religion
Thomas Hobbes