43.And the nations, despite a difference of development due to diverse conditions of life and of culture, are not destined to break the unity of the human race, but rather to enrich and embellish it by the sharing of their own peculiar gifts and by that reciprocal interchange of goods which can be possible and efficacious only when a mutual love and a lively sense of charity unite all the sons of the same Father and all those redeemed by the same Divine Blood.