This one is to depict wisdom of a snake. They say a leader must be as wise a snake. So to be wise as a serpent means to have a good, basic, fundamental knowledge of what areas you can go into and what areas you cannot go into, and to always be on your guard against the snares, traps, and deceptions that the dark side will try and throw at you in order to try and knock you off course.

Also it is written in Gensis that the serpent is the master psychologist, and has an unerring sense of where the evil lurks in someone else’s heart, and how that evil can manifest in action.