Read: Ephesians 3:14-21 …he may strengthen you with power through his Spirit in your inner being… (Ephesians 3:16b).
What is your inner being? Many take this to mean the soul, with its faculties of reason and emotion and will. But I don’t think this is what Paul means here, because in 2 Corinthians 4 he gives us a clue about what he does mean when he says the inner being. There he says that our outward man is perishing, yet the inward man is being renewed day by day (4:16 NKJV). That is, for Christians there is something about us that is getting old, decaying and deteriorating; but there is also something about us that is getting more vital, increasing and becoming richer and deeper and stronger every day we live. And that is what he calls the inner being.
Your soul grows old as well as your body. It is clear that the soul is part of our life linked with the outer person, which is perishing day by day.
But that is not the inner being. The inner being is the human spirit. It is here that God begins the work of recovery. Not in the realm of our feelings, but in what psychologists would call the realm of the subconscious, the deep-seated part of our life, the fundamental element of our nature. When you are really discouraged, really brokenhearted and have given up, your condition is often described as dispirited. That is an accurate term. Your fundamental nature is dissatisfied. It is not merely a question of temporary boredom. That would be in the realm of the soul. But this is something that touches the spirit, right at the deepest level of human life, and you find yourself filled with despair and indifference.