All attachments serve as a false refuge for the personal identity. It’s not so much the specific attachment itself which is important, since ultimately consciousness is everywhere; it’s the fear of losing the attachment which is the actual issue. Everyone carries within them a subtle terror of the unknown; this is why only one in a million people have the nerve to go all the way through to samadhi.
You have to learn to face this fear. You face it day to day, in your daily practice, in your daily meditation, with the absolute certainty that you will face it at the last moment of the last breath of the last day of this life. You have the choice to put it off till then, or you can do it now. The fact is, it’s just like homework; the more you do now, the less you have to do later and when the moment of death does comes, it will be smoother.