This is how men dies, when one is so much attached and identified to the temporary material body which is really not us.
“The truth shall set you free ” (Bible), what truth is that?
The truth is that we are not this material body but the eternal spirit soul which resides in the body which is made up of pus, stool, urine and blood. The soul does not die when the body dies (Bhagavad Gita-As It Is), it lives on to proceed to the next life, to another body: spiritual when perfection is reached and to another material body when there are still material desires to be fulfilled.
The truth will liberate us from depression and anxieties about getting old, acquiring diseases, bad experiences like war, calamities (related to previous sins in this life and previous lives) and death. When we know that we are not this decaying and temporary body, then we can go through this life like the “sages” free from worries related to this “body”. For we know that our real self is eternal, it has no beginning and end, only the body has (Bhagavad Gita).
Then your are not afraid of anything, you can fight for those things that matter, beyond this temporary world.