“The law of nature instructs most animals to cherish and educate their infant progeny. The law of reason inculcates to the human species the returns of filial piety.” HumansReasonLawAnimalReturnSpeciesCherishEducateInfantLaws Of NaturePietyHuman SpeciesProgenyFilialFilial Piety Book:Guizot's Gibbon: History of the Decline and Fall of the Roman Empire Source: Guizot's Gibbon: History of the Decline and Fall of the Roman Empire