With A Course in Miracles, for most of us the journey starts in darkness. The lessons are designed to gradually lift us up out of the darkness into the light. As we read the text and learn of its instructions, we gradually piece together a clearer picture of what is true and real. Our learning begins to generalize. Things which made no sense before become internally supported and consistent.
Over time you move from the state of an intense focus on the form of the words, the surface layer, to the much deeper messages. You start to see the correlations between passages spread across different chapters. Gradually you get in behind the words and the clear-cut metaphysical basis for the course's expression comes into focus.
At that point you'll start finding yourself becoming more of a authority and more able to base things you express on the truth. As your intimacy with the truth increases you begin to come from it, built upon it, and start to act from the top down. That means you're beginning to shine your light and remember who you are, expressing from the inner awareness of love and from the higher plane of sanity.
Particularly if you look into the metaphysics of God's Kingdom you'll find there not only clarification about the end goal, but also clarification about where it all started. And as you understand better the mechanics of heaven you can really start to grasp the underlying basis for the entire systems of thought - both that of God and that of the ego. Seeing where it all originated and how it progressed and how it is then reversed gives you great perspective.
You're then able to let go of the "bottom up" approach and begin to fulfill your function more from the top down, acting on a basis of guidance and trust, remaining in the light, holding true to what's real, overlooking the lower rungs of the ladder through forgiveness. The mind and perception are stabilized and the root of your being begins to reveal itself.
You can now utilize this intimate knowledge of the underlying immortal Kingdom as a foundation on which ti build. On which to extrapolate. On which to base your expressions. And then once it has all become so much simpler and refined you are able to express in countless ways and words all of this stuff that emanates out from a forgiven mind, from a state of simpler love and wholeness and clarity.
What that essentially means is you have become the truth, aligned yourself with it, are expressing from it. Both through a metaphysical logical basis and through the extension of love and miracles. A mind that has aligned itself with its Creator now possesses the power of authorship, and that means you now speak for God just as the Holy Spirit does. This is where you have become a teacher of God, able now to be a representative of His Word and the light of the world. Heaven's emissary. An ambassador for eternal life. A messenger of peace. And a holy influence.