Sometimes you need a kick in the gut to realize what's wrong

Everyone, one way or another have this type of experience. Most likely, being a mischievous toddler might force you to learn how to behave properly with your parents resorting to capital punishment. It's similar to that but much more coincidental and less physical.

Let's have an example. Think of chocolates.

Almost every people in the world like chocolates or at the very least, enjoy eating them. But the milk ingredient in them prevents people who are lactose intolerant from eating a grand dose of those exquisite brown bars. Eat little, their stomach may start some grumbling. Risk eating too much, and it's a lengthy negotiation with the toilet bowl for them. Even though lactose intolerant individuals know the very fact that it's "painful" for them, they won't hesitate devouring a kiss or two.

Then, come a time, these stubborn miscreants will mistakenly ingest themselves far too much chocolate they can handle. This will result to a day or three of unbearable indigestion. After which, it will take years before they gorge their mouths on these scrumptious candy.

As a result, they realized that their body can't handle such things. They are now being cautious of what they eat, asking first before delving. For each question, their heart will be constantly telling them, "I want to", but their body will contradict, telling, "Stay back". Wondrous wisdom in effect.

The experience taught them one valuable thing. "To think first".