What is the only lesson to be learned? Seeing the impossibility of change and the reality of the Changeless. And this recognition comes from changing your mind about your mind by realizing the Mind’s Changeless reality. Call this reality Spirit or Love or Oneness or Eternity, by whatever name reality does not change. And this Identity in God remains the same eternally as Spirit.
Therefore seek not to change the world. Rather seek to change your mind about the world. Amen.