Thinking about eternity is not simply an esoteric mental exercise. It’s a cure for boredom, a panacea for the trivial, a respite from the mundane. And it’s the sort of thinking best done on your own. If you say to your spouse, “Let’s stay in tonight and bat around the notion of eternity,” chances are that he or she will look at you blankly and reply, “I was hoping it would never come to this.” Approach it calmly – there’s no need to work yourself up into a lather by drinking turpentine and spitting fire. But be careful. Intellectual escapades…