Empress & Prince of Wands: Rejuvenation and strength.

Interpretation of Knight of Wands from http://blog.tarotbroad.com/2009/05/21/thors-day--knight-of-wands-reversed-zernerfarber--celtic-wisdom.aspx:

"After taking some personal risks, you may be feeling the need to put intense energy into being with yourself and discovering your self. You're so committed to your own growth and direction that you may be unaware of the rest of the world. You may be strongly introverted now, or you may be exploring a part of your personality in a secret or hidden manner." Gail Fairfield

"Knights symbolize protection, strength, ambition and questing. Fire is associated with inspiration, energy, passion, feeling, enterprise, ambition, matters pertaining to the "spark of life", and the element of fire. Typically this card refers to someone who is energetic and enthusiastic about life, heedlessly charging ahead in search of adventure and excitement. The Knight of Wands can either represent qualities you possess or someone else in your life who possesses these qualities.

My Knight (or Prince) has come again. This time he is represented by the Warrior of Skill in the Celtic Wisdom deck and the Prince of Wands in the Zerner-Farber. This is Gwydion of Welsh myth and the Mabinogion. He is a bit of a trickster and a magician. He seems to regularly get himself into difficulties as a result of his magical workings."

From http://www.angelpaths.com/wands/wandskn.html:

The man represented by the Knight of Wands will be a loving and open-hearted person, with a strong sense of morality and a great sense of humour. He will be active, energetic and willing to help. You often find these types of men in the healing professions, or in other areas where they are required to assist, guide and support others.

He's a man with a deep respect for life and all living things, attuned to Nature and to the creatures of the earth. He has a deep well of compassion which spills over readily to anyone who needs his help, but he also has the restraint to know when too much assistance is a bad thing. Then he will act to enable and empower, rather than to assisting.

[...]He could be defined as an idealistic realist - accepting the frailties of the race, whilst doing his best to strengthen it.

His faults spring from his good points - for instance, he dislikes causing pain, and will therefore delay when he needs to act if he thinks it will hurt other people. He will sometimes remain in limiting or painful circumstances because of this. His sense of rightness and duty is intense, and sometimes drives him to make foolish choices and decisions. He will shy away from conflict and unpleasant situations, especially when these arise as a result of his own needs, though he will never walk away from a struggle on behalf of somebody else.

If you are regarding this card as a spiritual change, then see it as an indication that the warrior of right and light is required - you'll need to stand up for something that matters, and which is unable to defend itself.