As a kid, I loved Mission Sundays, when missionaries on furlough brought special reports in place of a sermon …. There is one visit I've never forgotten. The missionaries were a married couple stationed in what appeared to be a particularly steamy jungle. I'm sure they gave a full report on churches planted or commitments made or translations begun. I don't remember much of that. What has always stayed with me is the story they shared about a snake.

One day, they told us, an enormous snake—much longer than a man—slithered its way right through their front door and into the kitchen of their simple home. Terrified, they ran outside and searched frantically for a local who might know what to do. A machete-wielding neighbor came to the rescue, calmly marching into their house and decapitating the snake with one clean chop.

The neighbor reemerged triumphant and assured the missionaries that the reptile had been defeated. But there was a catch, he warned: It was going to take a while for the snake to realize it was dead.

A snake's neurology and blood flow are such that it can take considerable time for it to stop moving even after decapitation. For the next several hours, the missionaries were forced to wait outside while the snake thrashed about, smashing furniture and flailing against walls and windows, wreaking havoc until its body finally understood that it no longer had a head.

Sweating in the heat, they had felt frustrated and a little sickened but also grateful that the snake's rampage wouldn't last forever. And at some point in their waiting, they told us, they had a mutual epiphany.

I leaned in with the rest of the congregation, queasy and fascinated. "Do you see it?" asked the husband. "Satan is a lot like that big old snake. He's already been defeated. He just doesn't know it yet. In the meantime, he's going to do some damage. But never forget that he's a goner."

The story [still] haunts me because I have come to believe it is an accurate picture of the universe. We are in the thrashing time, a season characterized by our pervasive capacity to do violence to each other and ourselves. The temptation is to despair. We have to remember, though, that it won't last forever. Jesus has already crushed the serpent's head.