And Adam knew Eve his wife; and she conceived, and bore Cain, and said, I have gotten a man from the LORD.
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Augustine of Hippo
AD 430
Cain was followed by Abel, who was killed by his brother and served as the first prophetic symbol of the . He was like an alien on earth, destined to suffer cruel persecutions at the hands of the wicked men who can properly be called natives of earth because they love this world as their home and find their happiness in the worldly felicity of the earthly city.