What did the old Reformers say is the greatest thing that can happen to a believer?

Les explains that one of the old Reformers—and perhaps even Scripture—said the greatest thing that can happen to the believer is to die. For the saint, death is glorious because it is just on to something far better; it is the blessed hope of resurrection, not a prospect of eternal doom. Les notes that we naturally dislike facing death for many reasons, such as leaving loved ones and our own designs. But for those who have not experienced this identification, death is horrible and to be feared because it leads to something a thousand times worse.