MISTAKE

Mistakes are common. Everyone commits mistake. 
We as human being commit mistake which either  hurt others or  hurt ourselves.
Mistakes are forgiven when they are done unintentionally. But sometimes we commit them intentionally!!!!

Sometimes we do something which in-turn becomes a fault and hurts the other person as their opinion might be different, sometimes they are unintentional. Every human being should be careful with regards to their words and actions as we are social beings.

It's necessary that we need to learn from our mistakes so that we over come them 
and commit some new ;-) .