What if Salvation is about this Life? Bonhoeffer's Religionless Christianity

In a letter written to Eberhard Bethge, Dietrich Bonhoeffer writes, "The Christian hope of resurrection is different from the mythological in that it refers people to their life on earth in a wholly new way...Christians do not have an ultimate escape route out of their earthly tasks and difficulties into eternity." In other words, the gospel is not good news about life after we die, it is good news for out life in and for this world. How does this change what it means to live a Christian life?