We are what we were and what we shall be. Theres nothing you can teach or learn because we're a dream all different dreams. Think about teaching within a dream about your current dream to another's dream, both of them make no sence while awake so how could they gain anything truthful from one another?

ACIM along with every other true spiritual study is the art of becomming selfless. you're not really in a body you dont taste or smell or touch, thinking you do is the same as thinking your dreams are real, the meaning of these words isnt even real. How could anything exist if there is only God?