Speak to High Priestess Laurena in Stormwind.
You're needed in Stormwind, <name>. The High Priestess there, Laurena, says it's time for you to prove you're worthy of the next level of your training. Don't waste too much time finding your way there. You can find her in the Cathedral of Light in the center of the city. Give her my regards, and prove how worthy you are of such a calling. The Light be with you, <name>.
I'm glad you've arrived, <name>. There are many things we will have to discuss, but more importantly is your training in the ways of the Light.
There are lessons all servants of the Light must learn. If you are ready, we'll begin discussing some of those now.
This quest starts at Teldrassil and ends at Stormwind City