40. Adam and his descendents are represented in Genesis as men essentially intelligent, since from the second generation they have built cities, cultivated the Earth, and worked with metals. Their progress in the arts and sciences was at all times rapid and constant. We cannot, therefore, conclude that a race so numerous could have proceeded, thus highly gifted, from a people of most rudimentary intelligence who were still in the days of simple animality, and at the same time have lost all trace of their descent, so that they had not even a traditional memory of their ancestors. A difference so radical in intellectual abilities, and also in moral development, proves, with no small degree of evidence, that this race had a distinct origin.