Pain is an awareness of bodily damage.
Creatures with an awareness that their body has been damaged or an awareness that their body could be damaged by remembering past events have the capacity to live longer and live to an age where they can reproduce.
Pain helps keep us alive
One can also ask "What are the purpose of eyes or ears or any of our sensory organs that make us aware of our environment ?"
Pain let's us know that some kind of damage has taken place.
Creatures with an awareness that their body has been damaged or an awareness that their body could be damaged by remembering past events have the capacity to live longer and live to an age where they can reproduce.
Pain helps keep us alive
One can also ask "What are the purpose of eyes or ears or any of our sensory organs that make us aware of our environment ?"
Pain let's us know that some kind of damage has taken place.
Insanity - Doing the same thing over and over again, expecting a different result