Great question!

This may help a little:
"Although the serpent was cunning, it was only more cunning than the dumb animals that were governed by Adam. It is not true that because the serpent surpassed the level of animals in cleverness, it was immediately raised up to the level of human rationality. It was only more clever than those animals that lack reason and was only more crafty than the animals that had no mind. For it is clear that the serpent, which did not have the mind of man, did not possess the wisdom of mankind. Adam was also greater than the serpent by the way he was formed, by his soul, by his mind, by his glory and by his place. Therefore it is evident that in cunning also Adam was infinitely greater than the serpent." ~ St. Ephrem the Syrian; Commentary on Genesis 2.15.1 Ancient Christian Commentary on Scripture Genesis 1:11