For some insight into the value of pain, and the hazards of being without it, Pain: the Gift Nobody Wants (also published as The Gift of Pain) by Paul Brand & Philip Yancey is a fascinating read.

https://www.amazon.co.uk/Pain-Nobody-Wants-Paul-Brand/dp/006...

https://www.amazon.co.uk/Gift-Pain-Hurt-What-About/dp/031022...