That's why I'm saying that sorry is one of the strongest word.

Yes indeed. As my point of view, this word is strong enough to even prevent a murder. If someone did proper analysis for prisoners, most of them would end their lives in a dark prison due to lack of patience, their ego to pardon their mistakes.

I have seen on many occasions, we all try to move forward with our own ego and not ready to second to others. Actually, saying "sorry" when making a mistake is not a big deal and we all should make our mind setups towards.