When you're in a burning building looking out of the twentieth story window down to the street and all you see is clouds of billowing smoke, you have to choose to believe the firemen below who tell you they have a safety net and it's safe to jump. When the clouds of smoke disappear, you don't have to believe any more: you see it. In this world, it's a leap in the dark; in the next world, it's a leap in the light.