After the previous posting, I realized that I used an expression "dying before death" without sufficient explanation. I assumed (and you know what that means) that it was "self-evident". Sorry. Of course, as with all spiritual teachings, there are a number of ways to explain it. The way I understand it is this: that it is much like the Hindu and Buddhist ideas of non-attachment. Be "in the world, but not of it." Participate in life to the full extent, but know that there is more to life than what you perceive with your five senses. Do your duty, but do not be attached to the outcome (Bhagavad Gita)
Carlos Casteneda's Don Juan said to see Death as an advisor. Live as if you have all the time in the world with the knowledge that you could die any moment. If you knew you only had six months to live, what would you change about your current life? Sometimes our outer circumstances may be impossible to change, but we can always change our attitude about them.
In other words, be unattached to the things of this world, learn to let go (eventually we have to let go of everything, even our bodies), and come to know the spiritual realm while still in this world through connection with God, The One, The Source, Unity or whatever you call it.
And as Sponge Bob would say "Good luck with that!"