We shouldn't let our desires roam too far from what we can actually get. We need to keep them focused on what's nearby and possible, since they won't stand being completely locked up. We should avoid chasing things that are either impossible or extremely difficult to achieve. Instead, we should go after things that are close at hand and within reach. Remember this: all external things are equally unimportant. They may look different on the outside, but inside they're all equally hollow.
Moreover, we ought not to allow our desires to wander far afield, but we must make them confine themselves to our immediate neighbourhood, since they will not endure to be altogether locked up. We must leave alone things which either cannot come to pass or can only be effected with difficulty, and follow after such things as are near at hand and within reach of our hopes, always remembering that all things are equally unimportant, and that though they have a different outward appearance, they are all alike empty within.