Because we are born of God, and the life we live in these beautiful bodies is just a passing thing compared with how long our lives really are, no matter how you live here, it is going to cost you everything.
Laying down your life for your friends costs all you have and more. It takes the manifestation of the Spirit of God to have that kind of strength.
Wasting your life on frivolous entertainment or distraction will cost you all you have and more. It will cost the people who would have received blessing if we had been on duty.
So, its all spent. Half to death and the past, and half to Life and the future. Go ahead and be super rationaland look at every encounter as opportunity. Look at every loss as privilege. Count every injury as a sacrifice on the altar of praise that Jesus is worthy of.