Baser instincts, temptation or highter development, wisdom, healing power
Snake, is a sign for bad luck, which is determined by the distance to the persons card. It always brings hypocrisy, treason and loss with it.
A generic dittology: warning of 'baser instincts' and on the other hand encouragement to higher development (like the snake on the doctor's rod of Asclepius). Warning and encouragement can also apply at the same time!