Book excerpt: Christianity is a religion of salvation in which believers have always anticipated post-mortem bliss for the faithful and non-salvation for others. Here, Trumbower examines how and why death came to be perceived as such a firm boundary of salvation. Analyzing exceptions to this principle from ancient Christianity, he finds that the principle itself was slow to develop and not universally accepted in the Christian movement's first four hundred years. In fact, only in the West was this principle definitively articulated, due in large part to the work and influence of Augustine.