Story of the hot bath, Conquering life's problems

A kid maned Robert was left to the care of his grandmother from a very early age after the sudden death of his mom. 

In the old days, a bath consisted of a basin filled with lukewarm water, a scoop and a handmade, rudimentary washcloth.
The old way of checking the water temperature before immersing the infants consisted in dipping the elbow in the water. 

It acted a rudimentary thermometer since that part of the body contains a big concentration of nerve endings.

Grandma Nancy's elbow was calloused from old age, which greatly decreased its sensitivity.
As a result, she was dipping Robert in scorching hot water to give him his daily baths against all the protests and crying.

His virulent complaints subsided as time went by and his body got slowly accustomed to the temperature of the water.

As he grew older he acquired a huge tolerance to heat and could easily bathe in water that we could barely dip the tip of our fingers into.
The above example is an extreme one, but it shows that when we expose kids to manageable adverse conditions from a very early age, they will develop a tolerance to them, which would make their lives easier and cultivate skills that would help them navigate the intricacies of life.