I hope no man takes what I said about the living and dieing of men for mathematical demonstration.
William PettyThat some are poorer than others, ever was and ever will be: And that many are naturally querulous and envious, is an Evil as old as the World.
William PettyThe method I take to do this is not yet very usual; for instead of using only comparative and superlative Words, and intellectual Arguments, I have taken the course (as a Specimen of the Political Arithmetic I have long aimed at) to express myself in Terms of Number, Weight, or Measure; to use only Arguments of Sense, and to consider only such Causes, as have visible Foundations in Nature.
William Petty