The High Priestess is a strong, mysterious woman who is connected with her inner, deeper self. When the Fool comes along, the Magician has made him aware of his apparent skills, the High Priestess shows him to look deeper within himself to find his hidden skills. She challenges you to go deep within yourself to become more connected with yourself and confident in what you have to offer the world.
She is connected with intuition, psychic abilities, dreams and powerful emotions. She shows that now is a time in your life when the veil between the natural and supernatural worlds has been lifted. Instincts and natural timing play a big part when this card shows up in a reading. It is also a good time to focus on your mind power, meditation, intuition, divination and creativity to challenge and focus yourself.
Sources:
The Forest Witch 