Anger Changes Nothing

At times I think that my church is a mess.  Well, that is an opinion of course.  But we respond to our opinions.  I could get angry.  My church would still be the same.  I would not.  Anger is useless where it changes nothing but the angry person.  When I could actually make a change for the better, as I see it, I will need courage, not anger.  I think there is a famous prayer that says all this.