Freedom is a lie, an illusion that blinds us to the true state of our existence. It does not exist, or rather, cannot exist in a physical world.
You cannot fetter my mind, you may say, but I disagree. Your mind knows nothing of beyond; it is confined to the things you can think or imagine, or what others have thought or imagined, or what they will think or imagine. These thoughts are inevitably limited.
Perhaps the best possible explanation of “freedom” is “ignorance is bliss.”