expand : a burnt child dreads the fire
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A child is so innocent. It does not know that fire is dangerous. Without knowing or thinking about the consequences, it puts it's hands to touch the flames. However, when it feels the heat or it's hands gets burnt, the child will never repeat the same action. By experiment and from experience, the child has learnt to dread the fire. This is true not only of children but with any other person of any age. Everyone faces troublesome and sometimes dangerous ,situations in life. It is from that they learn how to behave correctly.
Take the example of a young man riding a motorbike without a helmet. One day he is caught by the police and fined. The next time, you can be sure that he will wear a helmet. It is his encounter with the law that teaches him to do the right thing. When a student who has the habit of copying in the examination is caught and punished, he or she will never do it again.
"Life teaches us in many ways. It is for us to learn."