Now the serpent was more subtle than any beast of the field which the LORD God had made. And he said unto the woman, Yea, has God said, you shall not eat of every tree of the garden?
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Ambrose of Milan
AD 397
The cause of envy was the happiness of man placed in paradise, because the devil could not brook the favors received by man. His envy was aroused because man, though formed in slime, was chosen to be an inhabitant of paradise. The devil began to reflect that man was an inferior creature yet had hopes of an eternal life, whereas he, a creature of superior nature, had fallen and had become part of this mundane existence.