Truth of Human Body

"VASANSI JIRNANI YATHA VIHAYA , NAVANI GRIHANTI NAROPARANI .

TATHA SHARIRANIVIHAY JIRNANYANYANI SANYATI NAVANI DEHI ."

As a person puts on new garments, giving up old ones . The soul similiarly accepts new material bodies , giving up the old ones.

by BHAGAVAD GITA

This shloka from BHAGAVAD GITA tells that every thing expires . Either its food or medicines or it is human body. So if we think deeply there is nothing to be selfish about . We got everything after we were born and after death we will leave everything behind .If nothing is permanent ,then why do we worry about the circumstances ..... ??