There have been a few times over the years when “The Walking Dead” has revealed surprising spiritual and even religious underpinnings — early on, I remember, there was the macabre scene of “walkers” sitting in the pews of a church, staring at the crucifix, as if waiting for the service to start.

Well, there was another moment Sunday night, when Father Gabriel — an Episcopal priest with a troubled and complicated past — remembers a valuable lesson he learned in the seminary. After sharing a bottle of whiskey with another survivor, he explains.