When one changes their heart a new world will appear. The Daily Dose from the Rebbe. First He chose the inner world—the world of human decision and purpose. Nothing caused Him to choose such a world—He did so because He so decided. And so we feel no cause to our decisions, we feel we do good or fail all on our own.
The thought of an inner world necessitated an outer world, a stage for the human drama. This outer world does have a cause—the inner world. And so, this world feels itself pulled along by cause and effect, each event caused by that which preceded it.
That is why the outer world cannot be changed, except by first making a change in the inner world. Change our hearts and a new world will appear.