Think about what you’re about to do, and imagine the result. Think of how many people will be happy, and how many sad, and how happy or sad they’ll be. Think about how soon they’ll be sad or happy, and for how long they’ll be sad or happy. Try to total it all up in your mind, and think about whether what you’re about to do will result in more total sadness or happiness. This one is tricky, but sometimes it’s the best way to find an answer.