Keeps peace in our hearts.
In response to a person's constant criticism of the Guru's happy smiling state of being the person was confounded and asked the guru why he kept smiling through his criticism. Because said the Guru if I don't respond to your criticism then it is still yours and you have to deal with it, it is not mine.
I took care of my little boy me.
He's going to teach me how to play.
I cured him of fearing criticism and reacting to It, along with the fear of failure and not being good enough.
From Course of Miracles, one interesting observation was when we criticize ourselves,
we are the victim in jail and the jailer who also has to be in the jail... both are illusions.
Dropping those thought processes are critical to spiritual and personal growth and freedom. "I am the peace of God" is much better thought practice and I substitute those thoughts when the others come up and just drop them.
Total self-love, self-forgiveness and acceptance keeps peace in our hearts… not always that easy to do, yet we must, especially to reach the state of silence so we can hear His will and feel His unconditional love. Only then can we give it to others.