" Life is short, Art long, Experience not easily obtained, Judgement difficult, and therefore it is necessary, that a Student not only exercise himself in considering several Figures, but also that he diligently read the writings of others who have treated rationally of this Science, and make it his business to find out the true natural causes of things by experiments, to know the certain places and processions of tee Planets and Fixed Stars, Constellations, etc., but above all to be a passionate lover of truth...."
