When we take a trip by airplane, we tend to focus on small things: the food, the movie, the person next to us.
Then if the plane suddenly drops, we forget all the small things. We think about death, about what we did with our life, about what might happen after we die.
But we can (and will) die any time, even sitting in a chair at home. The plane is always dropping. It's alright—it's a good thing—to enjoy life. We should enjoy it. But we should also enjoy the work of finding its deeper meaning, and not lose our life in little distractions and attachments.
The worst attachment of all is to be attached to the idea that the things all around us exist out there on their own, concretely, in the sense that they don't depend on how we lead our lives.
We begin to see through this wrong idea when we reach the second path: the Path of Preparation. Here we begin to realize—if only intellectually—that our own true nature, and the nature of everything else in the world, is that we very much come from how we treat others.