In dream symbolism, a snake often represents transformation or a threat you haven't fully named yet -- its shedding skin makes it a natural image for a self about to change shape. A calm snake can point to healing or hidden wisdom; one that strikes usually reflects a fear or conflict you've been avoiding rather than a literal danger.
When you are loathed use Venus who has very strong influx and quick response in this and other aspects, and means renovation and growth. - Picatrix (Andalusia, ~1000.AD)