A financial advisor I know describes the reality of investing money by saying, “Hope for the best and be prepared for the worst.” With almost every decision we make in life there is uncertainty about the outcome. Yet there is one course we can follow where no matter what happens, we know that in the end it will not be a wasted effort.

The apostle Paul spent a year with the followers of Jesus in Corinth, a city known for its moral corruption. After he left, he urged them in a follow-up letter not to be discouraged or feel that their…