For Kant, conscience is a kind of noumenal voice that speaks to us directly from within ourselves, giving us a certainty that is unavailable to us from outer or phenomenal experience. This is a philosophical way to describe morality, but Lewis puts it more simply: conscience is nothing other than the voice of God within our souls. It is the bridge that links the creature to the creator. Even the atheist hears this internal clarion call because even the atheist has morality at the core of his being, and while the atheist may have rejected God, God has not rejected him.