His doctrines include the denial of the possibility of attaining any knowledge of God by the use of reason (i.e. denial of natural theology), and renewed stress on the corruptions of sin. Although Barth's outlook on this world was bleak, he also allowed the possibility of redemption for everyone, unlike other Calvinists. The movement he represents is called crisis theology, or dialectical theology. His principal work was Die Kirkliche Dogmatik (Church Dogmatics).