Catholic writers tend to see humanity struggling in a fallen world. They combine a longing for grace and redemption with a deep sense of human imperfection and sin. Evil exists, but the physical world is not evil. Nature is sacramental, shimmering with signs of sacred things.... Catholicism is also intrinsically communal, a notion that goes far beyond sitting at Mass with the local congregation, extending to a mystical sense of continuity between the living and the dead. Finally, there is a habit of spiritual self-scrutiny and moral examination of conscience.