Are critics all bad? No, critics often provide valuable feedback and inspiration. Some critics will provide valuable suggestions that you can use to make improvements. Others will help you gauge whether or not your activities are making an impact. Even hate inspired criticism can prove useful in that it can inspire and motivate you to continue your work when you might otherwise feel ambivalent or lack motivation.
That is why I would rather deal with a vocal critic than a silent friend. Martin Luther King Jr. once said, “In the end, we will remember not the words of our enemies, but the silence of our friends.” The real enemy is apathetic, indifferent, and doesn’t give you much thought. While the people in your life who can potentially provide you with the most benefit are those who are interested in you, care about you, and are thinking of you. Even if that interest is critical in nature. Surprisingly, the person who hates you can inadvertently do more to help you than your silent friend. But that will depend on you and your perspective.
If only my critics knew how close I had come to giving up, but for their words, I was inspired to continue!
So the next time someone criticizes you and what you are doing….thank them!
Source: http://matthewcampisi.blogspot.com/2011/12/critics.html